不誠実な in 30 Seconds

  • Insincere, dishonest, or disloyal.
  • Lacking genuineness in actions or words.
  • Implies a breach of trust or integrity.
  • Used for people, actions, or statements.
Core Meaning
The Japanese adjective 不誠実な (fūseijitsu na) describes someone or something that lacks sincerity, honesty, or loyalty. It's used to express a feeling of betrayal or disappointment when someone's actions or words do not align with what is expected in terms of genuine commitment or truthfulness. This word carries a negative connotation, implying a moral failing or a lack of integrity.
Nuance and Application
When you encounter 不誠実な, think about situations where trust has been broken. This could be in personal relationships, business dealings, or even in public statements. For instance, a promise that is not kept, a confession that seems rehearsed rather than heartfelt, or a betrayal of confidence can all be described as 不誠実な. It's a strong word that conveys a sense of being deceived or let down. The opposite would be someone who is sincere, honest, and dependable.
Examples in Context
Imagine a friend who consistently borrows money but never repays it, always with excuses. Their behavior could be described as 不誠実な. In a business setting, a company that makes false advertising claims to attract customers is acting 不誠実な. Even a politician making promises they have no intention of keeping can be seen as 不誠実な. The word emphasizes the lack of genuine intention or truthful conduct. It's important to note that while it implies dishonesty, it often focuses more on the lack of genuine feeling or commitment rather than outright lying, though it can certainly encompass lying as well.
Broader Implications
The concept of 誠実 (seijitsu), meaning sincerity or honesty, is highly valued in Japanese culture. Therefore, its negation, 不誠実な, carries significant weight. It suggests a failure to uphold social norms and ethical standards. When used, it often signals a breakdown in trust and a potential end to a relationship or partnership. The feeling associated with encountering something 不誠実な is often one of disappointment, anger, or a sense of being wronged. It's a word that highlights the importance of character and integrity in interpersonal and societal interactions. It can be applied to actions, words, and even the general attitude of a person or entity. Consider a situation where someone apologizes insincerely, going through the motions without any real remorse. That apology would be considered 不誠実な. The term is versatile and can be used in a wide range of contexts where authenticity and trustworthiness are expected but are found to be lacking.

彼の不誠実な態度に失望した。

その会社は不誠実な広告で顧客を騙した。

Basic Sentence Structure
The adjective 不誠実な (fūseijitsu na) functions like other na-adjectives in Japanese. It can modify a noun directly, usually with the particle な (na) in between, or it can be used with the copula だ (da) or です (desu) to describe a subject.
Modifying Nouns
When describing a noun, you place 不誠実な before the noun, connected by な. This is a common way to specify that the noun possesses the quality of being insincere or dishonest. For example, to describe an insincere apology, you would say 不誠実な謝罪 (fūseijitsu na shazai). Similarly, if someone has a dishonest character, you might refer to their 不誠実な性格 (fūseijitsu na seikaku).
Describing a Subject
You can also use 不誠実な to make a statement about a subject. In this case, it often appears at the end of a sentence, usually followed by です (desu) in polite speech or だ (da) in casual speech. For instance, if you want to say 'His behavior was insincere,' you could say 彼の行動は不誠実でした (Kare no kōdō wa fūseijitsu deshita). This structure allows you to directly attribute the quality of insincerity to the subject.
Common Verbs and Phrases
不誠実な is often used in conjunction with verbs that express judgment or perception. For example, you might see phrases like 不誠実だと感じる (fūseijitsu da to kanjiru - to feel that someone is insincere) or 不誠実だと疑う (fūseijitsu da to utagau - to suspect someone of insincerity). It can also be used with verbs indicating actions that are insincere, such as 不誠実なことをする (fūseijitsu na koto o suru - to do something insincere). Understanding these patterns will help you recognize and use the word more effectively in various communicative situations.

その約束は不誠実なものだった。

彼の説明は不誠実だと感じた。

Personal Relationships
You'll frequently hear 不誠実な (fūseijitsu na) in discussions about relationships, particularly when trust has been broken. This can range from romantic relationships where infidelity or deceit has occurred, to friendships where one person has been disloyal or untrustworthy. People might describe a partner's actions as 不誠実な, or lament a friend's 不誠実な behavior. It's a strong term used to express deep disappointment and a sense of betrayal. Imagine a scenario where someone confides a secret to a friend, only for that friend to spread it around. The friend's actions would undoubtedly be labeled as 不誠実な.
Business and Professional Settings
In the corporate world, 不誠実な is used to describe unethical practices, deceptive marketing, or broken promises between businesses or between a business and its customers. For example, a company that engages in fraudulent activities or makes misleading claims in its advertising might be accused of 不誠実な business practices. A contract that is not honored in spirit, even if technically fulfilled, could also be deemed 不誠実な. News reports about corporate scandals or consumer complaints often feature this word. It signifies a lack of integrity and a disregard for fair dealing.
Politics and Public Discourse
Politicians and public figures are often scrutinized for their honesty and sincerity. If a politician makes a promise during a campaign and fails to follow through, or if their statements are perceived as misleading, their actions might be described as 不誠実な. Debates and media commentary on political issues frequently involve discussions about the sincerity of public officials. This word is used to question the integrity of their motives and the truthfulness of their words, impacting public trust.
Everyday Interactions and Judgments
Beyond these specific contexts, 不誠実な can appear in more general discussions about people's character. If someone consistently says one thing and does another, or if their apologies seem hollow, people might comment on their 不誠実な nature. It's a judgment that can be passed on individuals whose actions consistently lack genuineness or trustworthiness. This could be in casual conversations among friends, family discussions, or even in reviews of services. The core idea remains the same: a perceived lack of genuine commitment or honest intention.

政治家の不誠実な発言が問題になっている。

彼の不誠実なビジネス戦略にはがっかりした。

Confusing with Similar Concepts
A common pitfall for learners is to confuse 不誠実な (fūseijitsu na) with words that simply mean 'wrong' or 'bad.' While insincerity often leads to negative outcomes, 不誠実な specifically points to a lack of genuine intent, honesty, or loyalty. For example, doing something accidentally wrong isn't necessarily 不誠実な. The key is the intentional or habitual lack of truthfulness or commitment. Learners might use it to describe a simple mistake, when a word like 間違い (machigai - mistake) would be more appropriate.
Incorrect Particle Usage
As a na-adjective, 不誠実な requires the particle な (na) when directly modifying a noun. A frequent mistake is to omit this particle, treating it like a no-adjective or an i-adjective. For instance, saying 不誠実 人 (fūseijitsu hito) instead of the correct 不誠実な人 (fūseijitsu na hito) is grammatically incorrect. Similarly, when used predicatively at the end of a sentence, learners might incorrectly attach particles meant for other word types. It should be followed by だ (da) or です (desu) for a complete sentence, e.g., 彼は不誠実です (Kare wa fūseijitsu desu).
Overuse or Underuse
Some learners might overuse 不誠実な to describe any situation where they feel slightly inconvenienced or let down, diluting its strong meaning. Conversely, others might shy away from using it, fearing it's too strong or formal, even when it accurately describes a situation of clear dishonesty or disloyalty. It's important to understand that while it is a strong word, it's used in various contexts, from serious betrayals to more subtle forms of insincerity in everyday interactions. Finding the right balance through practice is key.
Pronunciation and Kanji
While not strictly a vocabulary mistake, mispronouncing the word or misremembering the kanji can lead to confusion. The pronunciation is fu-u-se-i-ji-tsu na. The kanji 不 (fu) means 'not' or 'un-', 誠 (sei) means 'sincerity' or 'honesty', 実 (jitsu) means 'truth' or 'reality', and な (na) is the adjectival particle. Mixing up the order or meaning of these kanji can lead to misunderstandings. For example, confusing it with a word that sounds similar but has different kanji could result in using it in an entirely inappropriate context.

彼は不誠実な人だ。

その約束は不誠実だった。

誠実な (seijitsu na) - Sincere, Honest
This is the direct antonym of 不誠実な. 誠実な describes someone or something that is genuinely honest, sincere, and trustworthy. It's the ideal quality that 不誠実な lacks. For example, a 誠実な人 (seijitsu na hito) is a person of integrity, while a 不誠実な人 (fūseijitsu na hito) is not. Using these two words in contrast helps highlight the meaning of 不誠実な.
嘘つき (usotsuki) - Liar
嘘つき is a noun that specifically refers to a person who tells lies. While a liar is certainly 不誠実な, not all 不誠実な behavior involves outright lying. For instance, someone who makes empty promises or acts in a way that betrays trust without necessarily uttering a direct falsehood could be described as 不誠実な but not necessarily as a 嘘つき. 嘘つき is more direct about the act of deception through speech.
不正 (fusei) - Injustice, Unfairness, Fraud
不正 is a broader term that covers various forms of wrongdoing, including injustice, unfairness, and fraud. While 不誠実な actions can often lead to or involve 不正, 不正 itself doesn't always imply a lack of sincerity. For example, an unfair system might be described as 不正, even if the people running it believe they are acting justly. However, deliberate fraud is a clear example of both 不誠実な and 不正.
裏切り者 (uragirimono) - Traitor, Betrayer
裏切り者 is a noun for someone who betrays another person or a group. Betrayal is a specific type of 不誠実な behavior, often involving a breach of loyalty. While a traitor is undoubtedly 不誠実な, not all instances of 不誠実な behavior constitute outright betrayal. For example, insincere flattery is 不誠実な but not necessarily betrayal. However, a severe act of disloyalty would be both.
偽善者 (gizensha) - Hypocrite
偽善者 refers to a person who pretends to have virtues, beliefs, or feelings that they do not actually possess. This is a very close concept to 不誠実な, as hypocrisy is a form of insincerity. A 偽善者 is definitely 不誠実な in their portrayal of themselves. However, 不誠実な can also describe actions or statements that are not necessarily about self-portrayal but about a general lack of honesty or commitment.

彼は誠実な人物で、誰もが信頼している。

彼は嘘つきだから、彼の言葉は信用できない。

How Formal Is It?

Fun Fact

The kanji 誠 (sei) itself is composed of 言 (gen - word, speech) and 成 (sei - to become, to accomplish). This suggests that true sincerity involves words that are accomplished or true, and indeed, align with reality. The character 実 (jitsu) also relates to truth and reality, further emphasizing the meaning of being grounded in truth.

Pronunciation Guide

UK /fɯːseːdʑit͡sɯ na/
US /fuːseɪdʒɪtsu na/
Stress is generally even across syllables, with a slight emphasis on the first syllable 'fu'. The long vowel 'ū' in 'fū' also naturally draws a little attention.
Rhymes With
fūjitsu (不実 - unfaithfulness) keijitsu (قيقة - reality, though pronunciation differs) kijitsu (期日 - date, deadline) jissai (実際 - actually, in reality) shitsuboku (質朴 - simple, plain) jitaku (自宅 - own home) tsumori (つもり - intention) mukashi (昔 - long ago)
Common Errors
  • Pronouncing 'tsu' as a full syllable like 'too'. It should be a quick, sharp sound.
  • Confusing the vowel sounds, especially 'ei' (sei) and 'i' (ji).
  • Forgetting the 'na' particle when modifying a noun.
  • Mispronouncing the initial 'fu' sound, making it too soft or too hard.

Difficulty Rating

Reading 3/5

At the B1 CEFR level, learners can understand the main points of clear standard input on familiar matters regularly encountered in work, school, leisure, etc. This word fits within this scope, especially in contexts of personal relationships or business interactions. Understanding its nuances requires more than basic vocabulary.

Writing 3/5

Producing sentences with 不誠実な requires understanding its grammatical function as a na-adjective and its appropriate contexts. Learners at B1 can start using it appropriately, but precision in its application might still be developing.

Speaking 3/5

Using this word in spoken Japanese requires confidence and accurate grammatical application. Learners might hesitate to use such a strong word unless they are sure of its correct usage and context.

Listening 3/5

Recognizing 不誠実な in spoken Japanese is generally achievable for B1 learners, especially when it's used in clear contexts. The tone and surrounding words will help identify its meaning.

What to Learn Next

Prerequisites

誠実 (seijitsu) 嘘 (uso) 信頼 (shinrai) 態度 (taido) 行動 (kōdō)

Learn Next

偽善 (gizen) 裏切り (uragiri) 欺瞞 (giman) 信用できない (shinrai dekinai)

Advanced

信義 (shingi - fidelity, good faith) 忠義 (chūgi - loyalty, allegiance) 良心 (ryōshin - conscience)

Grammar to Know

Na-Adjective Conjugation

不誠実だ (fūseijitsu da) -> 不誠実な (fūseijitsu na) when modifying a noun. Example: 不誠実な態度 (fūseijitsu na taido).

Use of the particle 'to' (と) for reporting thoughts or speech

彼の言葉は不誠実だと感じた。(Kare no kotoba wa fūseijitsu da to kanjita.) - I felt that his words were insincere.

Adverbial form of adjectives using 'ni' (に)

彼は不誠実に振る舞った。(Kare wa fūseijitsu ni furumatta.) - He behaved insincerely.

Using 'sa' (さ) to form abstract nouns

不誠実さ (fūseijitsu sa) - insincerity. Example: 彼の不誠実さが問題だ。(Kare no fūseijitsu sa ga mondai da.) - His insincerity is a problem.

Using 'mono' (もの) to refer to things or abstract concepts

それは不誠実なものだ。(Sore wa fūseijitsu na mono da.) - That is an insincere thing.

Examples by Level

1

これは不誠実な行動です。

This is insincere behavior.

Using 不誠実な to modify 行動 (kōdō - behavior).

2

彼の言葉は不誠実だった。

His words were insincere.

Using 不誠実な to describe 言葉 (kotoba - words).

3

不誠実な約束はしない。

I don't make insincere promises.

Using 不誠実な to modify 約束 (yakusoku - promise).

4

その態度は不誠実に見える。

That attitude seems insincere.

Using 不誠実な to describe 態度 (taido - attitude).

5

彼女は不誠実な人だ。

She is an insincere person.

Using 不誠実な to modify 人 (hito - person).

6

それは不誠実な提案だ。

That is an insincere proposal.

Using 不誠実な to modify 提案 (teian - proposal).

7

彼は不誠実なことを言った。

He said something insincere.

Using 不誠実な to modify こと (koto - thing/action).

8

この状況は不誠実だ。

This situation is insincere.

Using 不誠実だ to describe 状況 (jōkyō - situation).

1

彼の不誠実なやり方に腹が立った。

I got angry at his insincere way of doing things.

Using 不誠実な to modify やり方 (yarikata - way of doing things).

2

その会社は不誠実な広告を出していた。

That company was running insincere advertisements.

Using 不誠実な to modify 広告 (kōkoku - advertisement).

3

彼女の謝罪は不誠実に聞こえた。

Her apology sounded insincere.

Using 不誠実に (fūseijitsu ni - adverbially) to modify 聞こえた (kikoeta - sounded).

4

私たちは彼の不誠実な態度を許せない。

We cannot forgive his insincere attitude.

Using 不誠実な to modify 態度 (taido - attitude).

5

その計画は不誠実な意図に基づいている。

That plan is based on insincere intentions.

Using 不誠実な to modify 意図 (ito - intention).

6

彼はいつも不誠実な言い訳をする。

He always makes insincere excuses.

Using 不誠実な to modify 言い訳 (iiwake - excuse).

7

このような不誠実な取引は許されない。

This kind of insincere transaction is unforgivable.

Using 不誠実な to modify 取引 (torihiki - transaction).

8

彼の行動は不誠実だと皆が思った。

Everyone thought his actions were insincere.

Using 不誠実だと (fūseijitsu da to) to report a thought about 行動 (kōdō - actions).

1

長年の友人からの不誠実な裏切りは、心に深い傷を残した。

The insincere betrayal from a long-time friend left a deep wound in my heart.

Using 不誠実な to modify 裏切り (uragiri - betrayal).

2

会社は従業員に対して不誠実な対応をしたと非難された。

The company was accused of treating its employees insincerely.

Using 不誠実な to modify 対応 (taiō - response/treatment).

3

彼の言葉は甘かったが、その裏には不誠実な意図があった。

His words were sweet, but behind them lay insincere intentions.

Using 不誠実な to modify 意図 (ito - intention).

4

政治家が国民に対して不誠実な発言をすることは、信頼を失う原因となる。

Politicians making insincere statements to the public leads to a loss of trust.

Using 不誠実な to modify 発言 (hatsugen - statement/remark).

5

その契約は、一方にとって不誠実な条件を含んでいた。

That contract contained insincere terms for one party.

Using 不誠実な to modify 条件 (jōken - condition/term).

6

彼女は、彼の不誠実な態度にとうとう愛想をつかした。

She finally got fed up with his insincere attitude.

Using 不誠実な to modify 態度 (taido - attitude).

7

市場の混乱は、一部の企業の不誠実な行動から生じた。

The market confusion arose from the insincere actions of some companies.

Using 不誠実な to modify 行動 (kōdō - action).

8

彼は、自分の過ちを認めようとせず、不誠実な言い訳を続けた。

He continued with insincere excuses, refusing to admit his mistakes.

Using 不誠実な to modify 言い訳 (iiwake - excuse).

1

その小説は、登場人物たちの不誠実な人間関係を克明に描いている。

The novel vividly depicts the insincere relationships of its characters.

Using 不誠実な to modify 人間関係 (ningen kankei - human relationships).

2

長年の信頼関係が、一つの不誠実な行為によって崩壊した。

Years of trust were destroyed by a single insincere act.

Using 不誠実な to modify 行為 (kōi - act/deed).

3

彼は、自身の利益のために同僚に対して不誠実な振る舞いをした。

He behaved insincerely towards his colleagues for his own benefit.

Using 不誠実な to modify 振る舞い (furumai - behavior/conduct).

4

メディアは、その政治家の不誠実な発言を大きく取り上げた。

The media significantly covered the politician's insincere remarks.

Using 不誠実な to modify 発言 (hatsugen - statement/remark).

5

その慈善団体は、寄付者に対して不誠実な情報開示を行った。

The charity made insincere disclosures of information to its donors.

Using 不誠実な to modify 情報開示 (jōhō kaiji - information disclosure).

6

彼の成功は、多くの人々の不誠実な犠牲の上に成り立っていた。

His success was built upon the insincere sacrifices of many people.

Using 不誠実な to modify 犠牲 (gisei - sacrifice).

7

彼女は、彼の不誠実な約束にうんざりして、関係を終わらせることにした。

Tired of his insincere promises, she decided to end the relationship.

Using 不誠実な to modify 約束 (yakusoku - promise).

8

この状況は、我々の間で築き上げられてきた信頼に対する不誠実な挑戦である。

This situation is an insincere challenge to the trust we have built between us.

Using 不誠実な to modify 挑戦 (chōsen - challenge).

1

彼の演説は巧みだったが、その根底には国民を欺こうとする不誠実な意図が垣間見えた。

His speech was skillful, but at its root, one could glimpse insincere intentions to deceive the public.

Using 不誠実な to modify 意図 (ito - intention).

2

組織の不誠実な対応は、内部告発者に対する報復行為と見なされた。

The organization's insincere response was regarded as an act of retaliation against the whistleblower.

Using 不誠実な to modify 対応 (taiō - response/treatment).

3

歴史の記録は、しばしば権力者による不誠実な解釈によって歪められてきた。

Historical records have often been distorted by insincere interpretations by those in power.

Using 不誠実な to modify 解釈 (kaishaku - interpretation).

4

彼の成功譚は、実際には多くの不誠実な犠牲と不正行為の上に築かれていた。

His success story was, in reality, built upon many insincere sacrifices and dishonest practices.

Using 不誠実な to modify 犠牲 (gisei - sacrifice).

5

その企業の広報戦略は、消費者の懸念に対して不誠実な回答を繰り返すばかりだった。

The company's public relations strategy repeatedly offered insincere answers to consumer concerns.

Using 不誠実な to modify 回答 (kaitō - answer/response).

6

長年にわたる友情が、彼の不誠実な嘘によって決定的に損なわれた。

Years of friendship were decisively damaged by his insincere lies.

Using 不誠実な to modify 嘘 (uso - lie).

7

この種の不誠実な取引は、市場全体の信頼性を揺るがしかねない。

This kind of insincere transaction can shake the credibility of the entire market.

Using 不誠実な to modify 取引 (torihiki - transaction).

8

彼の謝罪は、反省の念からではなく、単に世論を鎮めるための不誠実な試みだった。

His apology was not out of remorse, but merely an insincere attempt to appease public opinion.

Using 不誠実な to modify 試み (kokoromi - attempt).

1

その芸術家の作品は、しばしば表面的な美しさの裏に潜む人間の不誠実な側面を暴き出す。

The artist's works often expose the insincere aspects of human nature lurking beneath superficial beauty.

Using 不誠実な to modify 側面 (sokumen - aspect/side).

2

外交交渉における不誠実な駆け引きは、国際関係の不安定化を招く。

Insincere maneuvers in diplomatic negotiations lead to the destabilization of international relations.

Using 不誠実な to modify 駆け引き (kakehiki - maneuver/bargaining).

3

彼は、自らの不誠実な行動を正当化するために、巧妙な言葉遊びを用いた。

He employed clever wordplay to justify his own insincere actions.

Using 不誠実な to modify 行動 (kōdō - action).

4

その企業の決算報告は、投資家を欺くための不誠実な操作の痕跡を隠していた。

The company's financial reports concealed traces of insincere manipulation to deceive investors.

Using 不誠実な to modify 操作 (sōsa - manipulation/operation).

5

現代社会における情報過多は、しばしば不誠実な情報源によって増幅される。

Information overload in modern society is often amplified by insincere sources.

Using 不誠実な to modify 情報源 (jōhō gen - information source).

6

彼の長々とした自己弁護は、反省の欠如と不誠実な動機を露呈していた。

His lengthy self-defense revealed a lack of remorse and insincere motives.

Using 不誠実な to modify 動機 (dōki - motive/reason).

7

この歴史的文書は、当時の権力者たちが、民衆に対してどれほど不誠実な態度をとっていたかを示している。

This historical document shows how insincere an attitude the powerful figures of that time held towards the populace.

Using 不誠実な to modify 態度 (taido - attitude).

8

人間の本質に潜む不誠実な側面は、文学や芸術において繰り返し探求されてきたテーマである。

The insincere aspects lurking in human nature are themes that have been repeatedly explored in literature and art.

Using 不誠実な to modify 側面 (sokumen - aspect/side).

Common Collocations

不誠実な態度 (fūseijitsu na taido)
不誠実な発言 (fūseijitsu na hatsugen)
不誠実な行動 (fūseijitsu na kōdō)
不誠実な約束 (fūseijitsu na yakusoku)
不誠実な人間 (fūseijitsu na ningen)
不誠実な対応 (fūseijitsu na taiō)
不誠実な意図 (fūseijitsu na ito)
不誠実な取引 (fūseijitsu na torihiki)
不誠実な関係 (fūseijitsu na kankei)
不誠実な言葉 (fūseijitsu na kotoba)

Common Phrases

不誠実だと思われる (fūseijitsu da to omowareru)

— To be considered insincere.

彼の行動は不誠実だと思われる。 (Kare no kōdō wa fūseijitsu da to omowareru.) His actions are considered insincere.

不誠実だと感じた (fūseijitsu da to kanjita)

— I felt that it was insincere.

その謝罪は不誠実だと感じた。 (Sono shazai wa fūseijitsu da to kanjita.) I felt that the apology was insincere.

不誠実なやり方 (fūseijitsu na yarikata)

— An insincere way of doing things.

そんな不誠実なやり方はやめるべきだ。 (Sonna fūseijitsu na yarikata wa yameru beki da.) You should stop doing things in such an insincere way.

不誠実な態度をとる (fūseijitsu na taido o toru)

— To take an insincere attitude.

彼はしばしば不誠実な態度をとる。 (Kare wa shibashiba fūseijitsu na taido o toru.) He often takes an insincere attitude.

不誠実さを疑う (fūseijitsu sa o utagau)

— To doubt someone's sincerity.

彼の言葉の不誠実さを疑っている。 (Kare no kotoba no fūseijitsu sa o utagatte iru.) I am doubting the insincerity of his words.

不誠実な行為 (fūseijitsu na kōi)

— An insincere act.

それは許されない不誠実な行為だ。 (Sore wa yurusarenai fūseijitsu na kōi da.) That is an unforgivable insincere act.

不誠実な動機 (fūseijitsu na dōki)

— Insincere motives.

彼の行動の裏には不誠実な動機があった。 (Kare no kōdō no ura ni wa fūseijitsu na dōki ga atta.) There were insincere motives behind his actions.

不誠実な批判 (fūseijitsu na hihan)

— Insincere criticism.

その批判は不誠実なものだった。 (Sono hihan wa fūseijitsu na mono datta.) That criticism was insincere.

不誠実な返事 (fūseijitsu na henji)

— An insincere reply.

期待していた返事は不誠実なものだった。 (Kitai shite ita henji wa fūseijitsu na mono datta.) The reply I was expecting was insincere.

不誠実だと非難する (fūseijitsu da to hinan suru)

— To accuse someone of being insincere.

彼はその件で不誠実だと非難された。 (Kare wa sono ken de fūseijitsu da to hinan sareta.) He was accused of being insincere in that matter.

Often Confused With

不誠実な vs 不正直 (fushōjiki)

Both mean dishonest or insincere. 不誠実な often implies a deeper lack of loyalty or commitment, while 不正直な can sometimes refer more directly to straightforward lying or deceit.

不誠実な vs 偽り (itsuwari)

偽り means falsehood or lie. It's more about something being untrue or fake. 不誠実な describes the quality of a person or action that is not genuine or truthful.

不誠実な vs 無責任 (musekinin)

無責任 means irresponsible. While irresponsible actions can be insincere, the core meaning is a lack of accountability, not necessarily a lack of genuine intention.

Idioms & Expressions

"二枚舌を使う (nimaijita o tsukau)"

— To speak with a forked tongue; to say one thing and mean another; to be duplicitous. This idiom describes someone who is insincere by saying contradictory things or by being untruthful in their speech.

彼は二枚舌を使うので信用できない。 (Kare wa nimaijita o tsukau node shinrai dekinai.) He is untrustworthy because he speaks with a forked tongue.

Neutral/Informal
"口先だけの人間 (kuchisaki dake no ningen)"

— A person of mere words; someone who talks a lot but doesn't follow through. This describes someone whose promises or statements are insincere because they lack the will or intention to act upon them.

彼は口先だけの人間で、約束を守らない。 (Kare wa kuchisaki dake no ningen de, yakusoku o mamora nai.) He is a person of mere words and doesn't keep his promises.

Informal
"猫をかぶる (neko o kaburu)"

— To put on a cat's mask; to pretend to be innocent or meek when one is actually cunning or malicious. This describes an insincere facade, hiding one's true, less pleasant nature.

普段は大人しいが、実は猫をかぶっているだけだ。 (Fudan wa otonashii ga, jitsu wa neko o kabutte iru dake da.) He seems quiet normally, but in reality, he's just putting on a mask.

Informal
"腹に一物持つ (hara ni ichimotsu motsu)"

— To have something in one's belly; to harbor a hidden intention or scheme. This implies a level of insincerity and deceit, where someone has ulterior motives that they are not revealing.

あの人は腹に一物持っているようだ。 (Ano hito wa hara ni ichimotsu motte iru yō da.) That person seems to have a hidden agenda.

Neutral
"顔に書いてある (kao ni kaite aru)"

— It's written on their face. Used to describe someone whose insincerity or negative feelings are obvious from their facial expression.

彼の不満は顔に書いてあった。 (Kare no fuman wa kao ni kaite atta.) His dissatisfaction was written all over his face.

Informal
"嘘八百 (uso happyaku)"

— A string of lies; an outrageous lie. This refers to a large number of falsehoods, indicating extreme insincerity and dishonesty.

彼の言い訳は嘘八百だった。 (Kare no iiwake wa uso happyaku datta.) His excuses were a string of lies.

Informal
"空々しい (karagarashii)"

— Empty, hollow, insincere. Often used to describe compliments or apologies that lack genuine feeling.

その褒め言葉は空々しく聞こえた。 (Sono homekotoba wa karagarashiku kikoeta.) Those compliments sounded hollow.

Neutral
"本心を見せない (honshin o misenai)"

— To not show one's true feelings. This suggests a lack of sincerity and openness, often implying insincerity in interactions.

彼女は本心を見せない人だ。 (Kanojo wa honshin o misenai hito da.) She is someone who doesn't show her true feelings.

Neutral
"白々しい (shirajirashii)"

— Obvious, blatant, and insincere. Often used to describe an obvious lie or an insincere apology that is clearly fake.

彼の謝罪は白々しかった。 (Kare no shazai wa shirajirashikatta.) His apology was blatantly insincere.

Neutral
"尻尾を出す (shippo o dasu)"

— To show one's tail; to reveal one's true colors, often in a negative or deceitful way. This refers to the moment when insincerity or a hidden motive is exposed.

彼の不正がとうとう尻尾を出した。 (Kare no fusei ga tōtō shippo o dashita.) His dishonesty finally showed its tail.

Informal

Easily Confused

不誠実な vs 不正直 (fushōjiki)

Both words convey a lack of honesty and truthfulness.

不誠実な (fūseijitsu na) emphasizes a lack of genuine commitment, loyalty, or deep sincerity. It often implies a betrayal of trust. 不正直な (fushōjiki na) is more directly about dishonesty, lying, or being untruthful. While there's overlap, 不誠実な can encompass a broader range of insincere behaviors beyond just outright lies.

彼の<mark>不誠実な</mark>態度は、約束を守らないことだけでなく、態度全体に表れていた。 (Kare no fūseijitsu na taido wa, yakusoku o mamora nai koto dake de naku, taido zentai ni arawarete ita.) His insincere attitude wasn't just about not keeping promises, but was evident in his entire demeanor. 彼の<mark>不正直な</mark>発言は、事実を歪めていた。 (Kare no fushōjiki na hatsugen wa, jijitsu o yugamete ita.) His dishonest remarks distorted the facts.

不誠実な vs 偽り (itsuwari)

Both relate to things not being real or true.

偽り (itsuwari) is a noun meaning falsehood, lie, or pretense. It refers to something that is not genuine or true. 不誠実な (fūseijitsu na) is an adjective describing a person or action as lacking sincerity or honesty. You can have 偽りの言葉 (itsuwari no kotoba - false words), and someone who uses them might be described as 不誠実な.

その<mark>偽り</mark>の謝罪は、彼の不誠実さを物語っていた。 (Sono itsuwari no shazai wa, kare no fūseijitsu sa o monogatatte ita.) That false apology spoke of his insincerity. 彼は<mark>偽り</mark>の感情で接してきた。 (Kare wa itsuwari no kanjō de sesshite kita.) He approached me with false emotions.

不誠実な vs 裏切り (uragiri)

Betrayal is a form of insincere behavior.

裏切り (uragiri) specifically means betrayal or treachery, a direct violation of loyalty or trust. It is a strong consequence of being 不誠実な (fūseijitsu na). While all裏切り is 不誠実な, not all 不誠実な behavior constitutes a full betrayal. For example, making an insincere compliment is 不誠実な but not necessarily a betrayal.

友人からの<mark>裏切り</mark>は、彼の不誠実さを証明した。 (Yūjin kara no uragiri wa, kare no fūseijitsu sa o shōmei shita.) The betrayal from his friend proved his insincerity. 彼の<mark>不誠実な</mark>言動は、やがて裏切りにつながった。 (Kare no fūseijitsu na gendō wa, yagate uragiri ni tsunagatta.) His insincere words and actions eventually led to betrayal.

不誠実な vs 虚偽 (kyogi)

Both relate to untruthfulness.

虚偽 (kyogi) is a formal term meaning falsehood, untruth, or falsity, often used in legal or official contexts. It refers to factual inaccuracies or deliberate misrepresentations. 不誠実な (fūseijitsu na) is broader, encompassing a lack of sincerity, honesty, and loyalty, which may or may not involve factual untruths but rather a lack of genuine intention.

報告書に<mark>虚偽</mark>があったことが判明した。 (Hōkokusho ni kyogi ga atta koto ga hanmei shita.) It was revealed that there were falsehoods in the report. 彼の<mark>不誠実な</mark>説明は、虚偽を隠そうとするものだった。 (Kare no fūseijitsu na setsumei wa, kyogi o kakusō to suru mono datta.) His insincere explanation was an attempt to hide falsehoods.

不誠実な vs 空虚 (kyokyo)

Both can imply a lack of substance or genuineness.

空虚 (kyokyo) means emptiness, void, or hollowness. It often describes a feeling of inner emptiness or a lack of meaning. While insincere actions can feel empty or hollow, 空虚 itself doesn't directly imply dishonesty or disloyalty. It's more about a state of being or feeling.

彼の言葉は<mark>空虚</mark>で、何も伝わってこなかった。 (Kare no kotoba wa kyokyo de, nani mo tsutawatte konakatta.) His words were empty and conveyed nothing. <mark>不誠実な</mark>関係は、しばしば空虚感をもたらす。 (Fūseijitsu na kankei wa, shibashiba kyokokan o motarasu.) Insincere relationships often bring about a sense of emptiness.

Sentence Patterns

A2

Noun + は/が + 不誠実な + Noun + です/だ。

彼の<mark>不誠実な</mark>態度は問題です。 (Kare no fūseijitsu na taido wa mondai desu.)

A2

Noun + は/が + 不誠実だと + 思います/感じます。

その話は<mark>不誠実だと感じました</mark>。 (Sono hanashi wa fūseijitsu da to kanjimashita.)

B1

Noun + の + 不誠実さ + が + 目立ちます/気になります。

彼の<mark>不誠実さ</mark>が目立ちます。 (Kare no fūseijitsu sa ga medachimasu.)

B1

Noun + (verb in te-form) + 不誠実な + Noun + を + します/しました。

約束を破る<mark>不誠実な</mark>行動をしました。 (Yakusoku o yaburu fūseijitsu na kōdō o shimashita.)

B2

Noun + は、Noun + に + 対する + 不誠実な + 対応/態度 + で + 非難された。

会社は顧客<mark>に対する不誠実な対応</mark>で非難された。 (Kaisha wa kokyaku ni taisuru fūseijitsu na taiō de hihan sareta.)

B2

Noun + は、Noun + の + 裏に + 不誠実な + 意図 + が + ある。

その提案<mark>の裏に不誠実な意図</mark>がある。 (Sono teian no ura ni fūseijitsu na ito ga aru.)

C1

Noun + は、Noun + の + 不誠実さ + を + 露呈する/浮き彫りにする。

その事件は、組織<mark>の不誠実さ</mark>を露呈した。 (Sono jiken wa, soshiki no fūseijitsu sa o rotei shita.)

C1

Noun + は、Noun + を + 欺く + (ための) + 不誠実な + 手段/操作 + である。

その報告書は、投資家<mark>を欺くための不誠実な操作</mark>であった。 (Sono hōkokusho wa, tōshika o azamuku tame no fūseijitsu na sōsa de atta.)

Word Family

Nouns

不誠実 (fūseijitsu) Insincerity, dishonesty, disloyalty.

Adjectives

不誠実な (fūseijitsu na) Insincere, dishonest, disloyal.

Related

誠実 (seijitsu) Sincerity, honesty, faithfulness.
誠実な (seijitsu na) Sincere, honest, faithful.
誠実に (seijitsu ni) Sincerely, honestly, faithfully.
実 (jitsu) Truth, reality, substance.
誠 (makoto) Truth, sincerity, reality.

How to Use It

frequency

Moderately frequent, especially in contexts involving trust, ethics, and relationships.

Common Mistakes
  • Omitting the 'na' particle when modifying a noun. 不誠実な人 (fūseijitsu na hito)

    Learners sometimes forget that 不誠実な is a na-adjective and treat it like an i-adjective or no-adjective. The correct form when preceding a noun is always 不誠実な.

  • Using 不誠実な to describe simple mistakes. それは間違いでした (Sore wa machigai deshita).

    不誠実な implies a lack of sincerity, honesty, or loyalty, often with intent. A simple error or accident is not necessarily insincere. Using 不誠実な for a minor mistake is an overstatement.

  • Confusing it with 嘘つき (usotsuki - liar). 彼は不誠実な人だ (Kare wa fūseijitsu na hito da).

    While a liar is certainly 不誠実な, not all insincere behavior involves outright lying. 不誠実な is broader and can include disloyalty, lack of commitment, or hollow apologies. 嘘つき specifically refers to someone who tells lies.

  • Using it in overly casual situations where a milder term would suffice. 彼はちょっと不真面目だ (Kare wa chotto fumajime da).

    不誠実な is a strong word. In very casual conversations, if someone is merely being a bit unreliable or not serious, a milder term like 不真面目な (fumajime na - not serious) or 無責任な (musekinin na - irresponsible) might be more appropriate.

  • Mispronouncing 'tsu' as a full syllable. fu-se-i-ji-tsu na

    The 'tsu' sound is a quick, sharp articulation, not a drawn-out syllable like 'too'. Practicing the pronunciation is crucial for accurate understanding and speaking.

Tips

Remember the な Particle

As a na-adjective, 不誠実な requires the particle な when it directly modifies a noun. For example, 'an insincere person' is 不誠実な人 (fūseijitsu na hito), not 不誠実人. When used predicatively at the end of a sentence, it's followed by です (desu) or だ (da), like 彼の態度は不誠実です (Kare no taido wa fūseijitsu desu).

Antonym Power

Understanding the antonym, 誠実な (seijitsu na - sincere, honest), can greatly help in grasping the meaning of 不誠実な. Contrast examples: 'He is a sincere person' (彼は誠実な人です) versus 'He is an insincere person' (彼は不誠実な人です).

Sound Association

Try associating the sound 'fu-seijitsu' with something negative. Perhaps 'foo-ey, that's insincere!' or connect 'seiji' (politics) with 'fuu' and 'tsu' to remember it's about insincere politicians.

Practice the 'tsu' Sound

The 'tsu' sound in 不誠実な can be tricky for English speakers. Practice making it a quick, sharp sound, similar to the 'ts' in 'cats', rather than a full syllable.

Cultural Significance

In Japan, sincerity (誠実) is highly valued. Therefore, 不誠実な is a serious accusation that can damage relationships and reputation. Understanding this cultural context helps appreciate the word's weight.

Sentence Building Practice

Write your own sentences using 不誠実な in different contexts: describing a person, an action, a statement, or a promise. This active practice will solidify your understanding and usage.

Distinguish from Similar Words

Be mindful of the difference between 不誠実な (insincere/disloyal), 不正直な (dishonest/lying), and 無責任な (irresponsible). While related, they have distinct nuances.

Active Listening

When listening to Japanese, pay attention to how native speakers use 不誠実な. Note the tone, context, and the surrounding vocabulary to better understand its practical application.

Break Down the Kanji

Understanding the kanji helps: 不 (un-), 誠 (sincerity), 実 (truth/reality). So, it literally means 'not sincere reality' or 'lack of true sincerity'.

Memorize It

Mnemonic

Think of 'Fu-seiji-tsu'. 'Fu' sounds like 'foo-ey', suggesting something unpleasant. 'Seiji' sounds like 'seiji' (politics), and politicians are often accused of being insincere. 'Tsu' is the sound of disappointment. So, 'Foo-ey, insincere politicians are disappointing!' This connects the sound to the meaning of insincerity.

Visual Association

Imagine a person offering a beautiful, shiny apple (representing 'real' or 'true' - 実 jitsu) but inside it's rotten and hollow (representing 'not' - 不 fu, and 'sincere' - 誠 sei). The contrast between the outward appearance and the inner reality highlights insincerity.

Word Web

不誠実な (fūseijitsu na) 誠実 (seijitsu) 実 (jitsu) 誠 (makoto)

Challenge

Write three sentences using 不誠実な to describe different situations: a person, a statement, and a promise. Then, write their antonyms using 誠実な.

Word Origin

The word 不誠実 (fūseijitsu) is a compound word formed from Chinese characters. It is composed of 不 (fu - not, un-), 誠 (sei - sincerity, honesty, truth), and 実 (jitsu - reality, truth, substance). The な (na) is the adjectival particle used to connect it to a noun.

Original meaning: The combination implies a lack of 'sincere reality' or 'true sincerity'.

Sino-Japanese (Kanji compound)

Cultural Context

Using 不誠実な is a strong accusation. It should be used when there is clear evidence of dishonesty, disloyalty, or a lack of genuine commitment. Misusing it can be offensive and damaging to relationships.

While English has words like 'insincere,' 'dishonest,' and 'disloyal,' the cultural weight attached to 不誠実な in Japan can be particularly significant due to the emphasis on group harmony and trust. A betrayal of trust can have more severe social consequences than in some Western contexts.

Many Japanese proverbs and sayings emphasize the importance of honesty and sincerity, implicitly warning against 不誠実な behavior. Historical accounts and literature often feature characters whose downfall is attributed to their 不誠実な actions or lack of integrity. Modern media, including news and dramas, frequently explores themes of deception and betrayal, often using terms like 不誠実な to describe the characters' flaws.

Practice in Real Life

Real-World Contexts

Personal relationships (friends, family, romantic partners) where trust is questioned or broken.

  • 彼の不誠実な態度に失望した。
  • 彼女の不誠実な嘘で関係が終わった。

Business and professional settings, discussing ethics, contracts, or customer service.

  • その会社の不誠実な取引が問題になった。
  • 従業員への不誠実な対応が批判された。

Political discourse, evaluating the sincerity of politicians and public figures.

  • 政治家の不誠実な発言は信頼を損なう。
  • 国民は政府の不誠実さを疑っている。

General judgments about character and behavior.

  • 彼は不誠実な人間だ。
  • その提案は不誠実だと感じた。

Media reports and news articles discussing scandals or unethical practices.

  • 不誠実な報道が世間を騒がせた。
  • 企業の不誠実な経営が明るみに出た。

Conversation Starters

"Have you ever felt someone was being insincere towards you? What happened?"

"What qualities do you think are most important in a friend? How does insincerity affect friendship?"

"In business, when is it okay to be strategic, and when does it cross the line into being insincere?"

"How can you tell if someone's apology is truly sincere or insincere?"

"What are some examples of insincere behavior you've seen in movies or TV shows?"

Journal Prompts

Reflect on a time you felt someone was insincere. Describe the situation and your feelings. How did it impact your trust?

Consider the difference between being honest and being insincere. When might someone choose to be insincere, and what are the consequences?

Write about a character from a book or movie who exhibited insincere behavior. Analyze their motives and the impact of their actions.

How important is sincerity in your own life? What steps do you take to ensure your own actions and words are sincere?

Imagine you are writing a letter to a politician. What would you say about the importance of sincerity in public life?

Frequently Asked Questions

10 questions

不誠実な (fūseijitsu na) means insincere, dishonest, or disloyal. It describes a lack of genuine commitment or truthfulness. 誠実な (seijitsu na) is its direct opposite and means sincere, honest, and faithful. It describes someone or something characterized by integrity and truthfulness. For example, 彼の態度は不誠実だった (His attitude was insincere), while 彼の態度は誠実だった (His attitude was sincere).

While primarily used for people's actions or character, 不誠実な can sometimes be used metaphorically for things that are deceptive or not as they seem. For instance, an advertisement that misleads consumers could be described as 不誠実な. However, it's much more common to apply it to human behavior and intentions.

Yes, 不誠実な is a strong word that carries a negative connotation. It implies a significant lack of integrity and trustworthiness. Therefore, it should be used carefully and when appropriate, as it can be a serious accusation.

As a na-adjective, it typically modifies a noun with な: 不誠実な態度 (fūseijitsu na taido - insincere attitude). It can also be used predicatively at the end of a sentence: 彼の行動は不誠実だ (Kare no kōdō wa fūseijitsu da - His actions are insincere).

It's often used in contexts involving broken promises, betrayals, dishonest business practices, misleading statements, or any situation where someone's actions or words lack genuine intent and trustworthiness.

No, generally not. A mistake is usually unintentional. 不誠実な implies an intentional or habitual lack of honesty, sincerity, or loyalty. For simple mistakes, words like 間違い (machigai) are more appropriate.

The noun form is 不誠実 (fūseijitsu), meaning insincerity, dishonesty, or disloyalty. For example: 彼の言葉には不誠実さが感じられた (Kare no kotoba ni wa fūseijitsu sa ga kanjirareta) - Insincerity could be felt in his words.

'Honne' refers to one's true feelings, and 'tatemae' is the facade one shows publicly. While 'tatemae' can sometimes involve presenting a less direct version of one's feelings, it becomes 不誠実な when the facade is used to intentionally deceive, manipulate, or betray trust, rather than just maintain social harmony.

Related words include 不正直な (fushōjiki na - dishonest), 偽りの (itsuwari no - false), 裏のある (ura no aru - cunning, deceitful), and 腹黒い (haraguroi - black-hearted, wicked).

Ensure the context clearly involves a lack of sincerity, honesty, or loyalty. Avoid using it for simple mistakes or misunderstandings. Pay attention to grammatical usage, especially the な particle when modifying nouns.

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