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A1 noun #2,500 most common 13 min read

性質

seishitsu
Practice it Examples Notes & Tips 性質 in 30 Seconds
Explanation 性質 in your Level:
At the CEFR A1 level, Japanese learners are just beginning their journey into the language. The word '性質' (seishitsu) is generally considered too advanced and abstract for absolute beginners, who are primarily focused on basic survival Japanese, simple greetings, and highly concrete vocabulary like everyday objects, basic verbs, and simple adjectives. At this stage, learners are taught words like 'いい' (good), 'わるい' (bad), 'おおきい' (big), and 'ちいさい' (small) to describe things. If they need to describe a person, they will learn '性格' (seikaku - personality) long before '性質'. However, it is beneficial for A1 learners to at least be introduced to the kanji '性' (sei), as it appears in very common beginner words like '女性' (josei - woman) and '男性' (dansei - man). Understanding that '性' relates to gender or nature lays a crucial foundation for when they eventually encounter '性質' in later stages. While an A1 learner is not expected to use or fully comprehend '性質', exposure to its components helps build kanji recognition skills. Teachers might briefly mention it if a student asks how to say 'property' in a science context, but the focus remains on simpler, more immediate communicative needs. The goal at A1 is to build a robust foundation of basic vocabulary, and abstract nouns like '性質' are reserved for when the learner has a stronger grasp of Japanese sentence structure and context.
As learners progress to the CEFR A2 level, their vocabulary expands to include more descriptive words and slightly more complex concepts. While '性質' (seishitsu) is still on the periphery of their required vocabulary, they might start encountering it if they read simple informational texts, watch educational children's programs, or begin exploring specific interests like basic science in Japanese. At this level, learners are comfortable with '性格' (seikaku) for describing people's personalities. The introduction of '性質' at the A2 level usually happens in contrast to '性格'. A teacher might explain, 'We use 性格 for people, but if we want to talk about what water or fire is like, we use 性質.' This helps the learner categorize vocabulary based on animate vs. inanimate objects. A2 learners can begin to understand simple sentences like '水の性質' (the properties of water) or '犬の性質' (the nature of dogs). They are learning to use the particle 'の' (no) effectively to connect nouns, making 'Aの性質' an accessible grammatical structure. Although they might not actively produce the word in spontaneous conversation, their passive recognition of '性質' improves. They learn that it means 'what something is like fundamentally'. This level is about bridging the gap between basic survival language and more descriptive, informational communication, and recognizing '性質' is a step toward that broader understanding.
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The CEFR B1 level marks a significant turning point where '性質' (seishitsu) becomes an active and essential part of a learner's vocabulary. At this intermediate stage, learners are expected to discuss a wider range of topics, including abstract concepts, basic science, social issues, and detailed descriptions of people and things. '性質' is perfectly suited for these tasks. B1 learners are taught to use '性質' to describe the inherent characteristics of materials, animals, and abstract ideas. They learn to construct sentences using verbs like '持つ' (motsu - to have) and 'ある' (aru - to exist) in conjunction with '性質', such as 'この布は水をはじく性質がある' (This cloth has the property of repelling water). Furthermore, B1 is the level where learners are introduced to the highly practical phrase '性質上' (seishitsujou - due to its nature). This allows them to explain reasons and constraints in a more sophisticated and objective manner, which is crucial for intermediate-level discussions and basic business Japanese. They also learn the idiom '性質が悪い' (seishitsu ga warui - malicious/nasty nature) and can apply it to difficult situations or problematic people. At B1, the distinction between '性格' (personality), '特徴' (feature), and '性質' (nature/property) must be clearly understood and accurately applied. Mastery of '性質' at this level demonstrates a learner's ability to move beyond simple descriptions and engage in more analytical and precise communication.
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At the CEFR B2 level, learners are achieving a high degree of fluency and can understand complex texts on both concrete and abstract topics. The use of '性質' (seishitsu) becomes natural, frequent, and nuanced. B2 learners are expected to read news articles, opinion pieces, and semi-academic texts where '性質' is used regularly to discuss economic trends, technological advancements, and societal issues. They can effortlessly comprehend phrases like '問題の性質' (the nature of the problem) or '化学的性質' (chemical properties) without hesitation. In their own output, B2 learners use '性質' to articulate complex arguments and detailed explanations. They can comfortably use it in formal settings, such as presentations or professional emails, particularly utilizing '性質上' to explain professional constraints or logical deductions. At this level, learners also understand the subtle emotional weight when '性質' is applied to humans, recognizing that it implies a deeply ingrained, perhaps unchangeable disposition, rather than just a superficial personality trait. They can engage in debates where they might need to differentiate between the '本質' (essence) and the '性質' (properties) of a subject. The B2 learner's grasp of '性質' is characterized by accuracy, appropriate register, and the ability to use it in a wide variety of complex, specialized contexts, demonstrating a strong command of upper-intermediate Japanese vocabulary.
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At the CEFR C1 level, learners possess an advanced, near-native operational proficiency in Japanese. Their understanding and usage of '性質' (seishitsu) are highly sophisticated and deeply integrated into their linguistic repertoire. C1 learners encounter '性質' in demanding academic papers, complex literary works, legal documents, and high-level professional discourse. They can instantly grasp the precise nuance of the word based on the context, whether it's being used in quantum physics, psychological profiling, or legal definitions. They are adept at using '性質' in complex grammatical structures and extended discourse. For example, they can seamlessly incorporate it into long relative clauses or conditional sentences to build intricate arguments. Furthermore, C1 learners are fully aware of the etymological roots of the word and can easily connect it to a vast network of related kanji compounds (熟語 - jukugo). They can effortlessly switch between synonyms like '特性' (tokusei), '本質' (honshitsu), '気質' (kishitsu), and '属性' (zokusei), choosing the exact word that provides the most precise meaning and appropriate tone for their specific audience. Their use of '性質が悪い' extends beyond simple complaints to nuanced critiques of systemic issues or complex phenomena. At the C1 level, '性質' is not just a vocabulary word to be translated; it is a conceptual tool used for high-level analysis, abstract reasoning, and eloquent expression in Japanese.
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The CEFR C2 level represents mastery of the Japanese language, equivalent to that of a highly educated native speaker. At this pinnacle of proficiency, the word '性質' (seishitsu) is wielded with absolute precision, elegance, and an intuitive understanding of its deepest cultural and linguistic implications. C2 learners can deconstruct complex philosophical, scientific, or literary texts where '性質' plays a central thematic role. They can engage in highly abstract debates, using '性質' to define the ontological status of concepts or the fundamental laws governing complex systems. Their output is characterized by a flawless selection of vocabulary, where '性質' is used not just correctly, but stylistically, to enhance the rhetorical impact of their speech or writing. They can play with the nuances of the word, perhaps using it ironically or metaphorically in creative writing or advanced rhetoric. A C2 learner understands the historical evolution of the term and how its usage might vary across different specialized fields or academic disciplines. They can effortlessly correct subtle misuses of the word by others, explaining the minute differences between '性質' and its closest synonyms with the clarity of a linguist. At the C2 level, the learner's relationship with '性質' transcends mere comprehension; it is an intrinsic part of their ability to think, reason, and articulate the most complex ideas possible in the Japanese language.
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Practice it Examples Notes & Tips

性質 in 30 Seconds

  • Refers to inherent nature or properties.
  • Used heavily in science (physics/chemistry).
  • Describes deep, innate human temperaments.
  • Often used as 性質上 (due to its nature).
The Japanese word '性質' (seishitsu) is a highly versatile and fundamental noun that serves to describe the inherent character, fundamental nature, or intrinsic property of either a person, a living organism, a substance, or an abstract concept. To truly grasp the depth of this vocabulary word, we must first break down its constituent kanji characters, which provide a profound insight into its etymological roots and conceptual framework. The first kanji, '性' (sei or shou), carries the meanings of sex, gender, nature, or disposition. It is a character frequently found in words related to human psychology, biological traits, and fundamental characteristics, such as '性格' (seikaku - personality) or '性別' (seibetsu - gender). The second kanji, '質' (shitsu or tachi), translates to quality, matter, substance, or temperament. It appears in words like '質問' (shitsumon - question) and '品質' (hinshitsu - quality). When these two powerful characters are combined into '性質', the resulting compound word literally translates to 'the nature of the substance' or 'the quality of the disposition'. This makes it an incredibly precise term for discussing what something fundamentally is, how it behaves under certain conditions, and what intrinsic traits define its existence.
Linguistic Breakdown
Understanding the kanji helps learners distinguish this word from similar vocabulary items.
In a scientific or academic context, '性質' is the go-to word for describing the physical or chemical properties of materials. For example, when discussing the properties of water, metals, or gases, scientists and educators will invariably use this term.

水の性質を調べる。(Investigating the properties of water.)

Beyond the hard sciences, '性質' is also extensively used to describe the inherent disposition or nature of human beings and animals. While '性格' (seikaku) is more commonly used for a person's everyday personality, '性質' delves deeper into their innate, almost unchangeable nature or temperament. It suggests a trait that is deeply ingrained and perhaps biological or genetic in origin.

彼は怒りっぽい性質だ。(He has an irritable nature.)

Human vs Material
The word seamlessly transitions between describing human temperament and material properties.
Furthermore, the word can be applied to abstract concepts, systems, or situations. For instance, one might discuss the 'nature of a problem' or the 'characteristics of a specific market'. In these cases, '性質' highlights the fundamental mechanics or underlying truths of the subject at hand.

この問題の性質上、解決には時間がかかる。(Due to the nature of this problem, it will take time to solve.)

It is crucial for Japanese learners to recognize that '性質' is a formal and somewhat objective term. It is less likely to be used in casual, everyday chatter about someone's mood and more likely to appear in analytical, descriptive, or professional discourse.

アルカリ性の性質を持つ物質。(A substance with alkaline properties.)

Formality Level
Highly appropriate for academic writing, news reports, and professional evaluations.
To summarize this section, '性質' is a dual-purpose powerhouse in the Japanese language. It allows speakers to articulate the intrinsic properties of the physical world while simultaneously providing a sophisticated vocabulary tool for analyzing human behavior and abstract phenomena. Mastering this word is a significant step toward achieving fluency and precision in Japanese communication.

犬は群れを作る性質がある。(Dogs have the nature of forming packs.)

Using the word '性質' (seishitsu) correctly requires an understanding of its grammatical function and the specific contexts in which it thrives. As a noun, it integrates seamlessly into standard Japanese sentence structures, typically modified by adjectives, noun phrases connected by the particle 'の' (no), or relative clauses. One of the most common ways to use '性質' is to describe what kind of nature or property something possesses. This is often achieved using the verb '持つ' (motsu - to have/possess) or 'ある' (aru - to exist/be). For example, when discussing a material that is highly flammable, you would say it 'has a flammable property'.

燃えやすい性質を持っている。(It has a highly flammable property.)

Grammar Connection
Often paired with verbs like 持つ (motsu) and ある (aru) to indicate possession of a trait.
Another highly frequent and incredibly useful grammatical pattern involves the suffix '上' (jou), creating the compound '性質上' (seishitsujou). This translates to 'by its nature', 'due to its nature', or 'inherently'. This phrase is indispensable in business, legal, and formal contexts when explaining why something must be a certain way or why a particular outcome is unavoidable.

業務の性質上、秘密厳守が求められる。(Due to the nature of the work, strict confidentiality is required.)

When describing people, '性質' is often modified by adjectives that describe temperament. Words like '穏やかな' (odayakana - gentle), '激しい' (hageshii - fierce), or '臆病な' (okubyouna - timid) are frequently placed before '性質'. It is important to note that when used for people, it often implies a trait that is difficult to change, something they were born with.

彼女は生まれつき穏やかな性質だ。(She has a naturally gentle disposition.)

Adjective Pairing
Use Na-adjectives and I-adjectives directly before the word to describe the specific nature.
In scientific and educational settings, '性質' is used to categorize and differentiate items. You will often see it in conjunction with words like '化学的' (kagakuteki - chemical) or '物理的' (butsuriteki - physical).

金属の物理的性質を研究する。(Researching the physical properties of metals.)

It is also common to use '性質' when discussing whether something is good or bad in its fundamental nature. The phrase '性質が悪い' (seishitsu ga warui) is particularly notable. While it can literally mean 'of poor quality', when applied to a person or a situation, it means 'malicious', 'vicious', or 'having a nasty nature'. For example, a persistent, difficult-to-cure disease or a particularly malicious computer virus might be described this way.

このウイルスは非常に性質が悪い。(This virus has a very nasty nature / is highly malicious.)

Idiomatic Usage
性質が悪い (seishitsu ga warui) is a common idiom for something inherently troublesome or malicious.
By mastering these various sentence patterns and collocations, learners can significantly elevate their Japanese proficiency, moving beyond simple descriptions to articulate complex, inherent characteristics with native-like precision and appropriate formality.
The word '性質' (seishitsu) is ubiquitous across a wide array of Japanese media, professional environments, and educational settings, making it an essential vocabulary item for anyone aiming for comprehensive fluency. Because of its analytical and descriptive nature, you are highly likely to encounter this word in contexts that require objective explanation or formal categorization. One of the primary places you will hear and read '性質' is in educational materials, particularly in the fields of science, biology, chemistry, and physics. From elementary school science classes to university-level research papers, '性質' is the standard term used to describe how materials react, how animals behave, and how physical laws operate.

磁石の性質について学びましょう。(Let's learn about the properties of magnets.)

Academic Context
Textbooks and lectures rely heavily on this word for clear, objective descriptions.
In the realm of news and journalism, '性質' frequently appears in reports discussing the characteristics of new technologies, the nature of economic trends, or the underlying factors of social issues. News anchors and journalists use it to provide depth and context to their reporting, explaining not just what happened, but the inherent nature of the elements involved.

この事件の性質を考慮すると、警察の対応は妥当だ。(Considering the nature of this incident, the police response is appropriate.)

The corporate and business world is another major domain where '性質' is constantly utilized. In meetings, product development discussions, and official documentation, professionals use it to describe product specifications, market behaviors, and the inherent requirements of specific jobs or contracts. The phrase '性質上' (due to its nature) is a staple in business correspondence and legal disclaimers.

製品の性質上、返品はお受けできません。(Due to the nature of the product, we cannot accept returns.)

Business & Legal
Crucial for writing disclaimers, terms of service, and professional explanations.
In pop culture, such as anime, manga, and literature, '性質' is often used during exposition. When a character is explaining the rules of a magic system, the innate abilities of a particular species, or the psychological makeup of an antagonist, this word is the perfect fit. It adds a layer of pseudo-scientific or analytical depth to the world-building.

奴の能力の性質を見極めろ！(Figure out the nature of his ability!)

Finally, in everyday adult conversation, while less common than '性格' (seikaku) for describing friends, '性質' is used when gossiping or warning others about someone's deeply ingrained, often negative, traits. Saying someone has a 'bad nature' (性質が悪い) is a strong statement about their fundamental character.

あの人は少し性質が悪いから気をつけて。(That person has a somewhat nasty disposition, so be careful.)

Everyday Warnings
Used to caution others about inherent dangers or difficult personalities.
Recognizing '性質' in these diverse environments will dramatically improve your listening and reading comprehension across all levels of Japanese media.
When learning the word '性質' (seishitsu), Japanese learners frequently encounter a few specific stumbling blocks, primarily involving the confusion between '性質' and other similar-sounding or conceptually related words. The most prevalent mistake is the interchangeable use of '性質' (seishitsu) and '性格' (seikaku). While both can be translated as 'character' or 'nature' in English, their usage in Japanese is distinct. '性格' is almost exclusively used to describe the personality of a human being or, occasionally, a pet. It refers to a person's psychological makeup, their behavior patterns, and how they interact with others on a daily basis (e.g., cheerful, shy, outgoing). '性質', on the other hand, refers to the innate, fundamental, and often unchangeable disposition or physical properties of a person, animal, or inanimate object.

❌ 鉄の性格を調べる。
⭕ 鉄の性質を調べる。(Investigating the properties of iron.)

Seikaku vs Seishitsu
Never use 性格 (seikaku) for inanimate objects or chemical properties.
Another common error is confusing '性質' with '特徴' (tokuchou). '特徴' translates to 'feature', 'characteristic', or 'peculiarity'. It refers to a specific, noticeable point that makes something stand out or differ from others. '性質' is broader; it encompasses the entire underlying nature or fundamental makeup of the thing, not just the standout features. A feature (特徴) is something you can easily observe, while a property (性質) is how something fundamentally exists or reacts.

❌ 水の特徴は100度で沸騰することだ。(While understandable, '性質' is better for physical laws.)
⭕ 水の性質は100度で沸騰することだ。(The property of water is that it boils at 100 degrees.)

Learners also sometimes struggle with the pronunciation, confusing 'seishitsu' with words like 'seishin' (精神 - spirit/mind) or 'seishiki' (正式 - formal/official) due to the shared 'sei' sound. Paying close attention to the 'shitsu' (quality/matter) ending is crucial for accurate communication.

❌ 彼の精神が悪い。(His spirit is bad - sounds unnatural here.)
⭕ 彼の性質が悪い。(He has a bad disposition.)

Pronunciation Pitfalls
Ensure the 'shitsu' is pronounced clearly to avoid confusion with 'seishin'.
Additionally, a subtle grammatical mistake occurs when learners try to use '性質' as an adjective directly without the particle 'の' (no) or without forming a compound. For example, saying '性質問題' (seishitsu mondai) instead of '性質上の問題' (seishitsujou no mondai - a problem of nature) is incorrect.

❌ それは性質違いだ。
⭕ それは性質が違う。(That has a different nature.)

By understanding these nuances and actively practicing the distinction between '性質', '性格', and '特徴', learners can avoid these common pitfalls and use Japanese with much greater accuracy and natural flow.

猫の性質を理解して飼うべきだ。(You should understand the nature of cats before keeping one.)

Contextual Accuracy
Always ask yourself: Am I describing a personality, a visual feature, or an inherent property?
The Japanese language is incredibly rich in vocabulary used to describe characteristics, traits, and fundamental natures. To truly master '性質' (seishitsu), it is highly beneficial to study it alongside its synonyms and related terms, understanding the subtle nuances that separate them. This comparative approach not only deepens your understanding of '性質' but also exponentially expands your expressive capabilities in Japanese. One of the closest synonyms is '特性' (tokusei). While '性質' refers to the general, inherent nature or properties of something, '特性' specifically focuses on the *special* or *unique* characteristics that distinguish it from others. It is often translated as 'specific characteristic' or 'special quality'. In engineering or product marketing, '特性' is frequently used to highlight what makes a material or product uniquely advantageous.

この素材の特性を生かしたデザイン。(A design that utilizes the unique characteristics of this material.)

性質 vs 特性
性質 is the general property; 特性 is the unique, distinguishing property.
Another deeply related word is '本質' (honshitsu), which translates to 'essence' or 'true nature'. While '性質' describes the properties that something exhibits, '本質' digs deeper into the absolute core of what something is, stripping away all superficial elements. It is a highly philosophical and analytical term. You might discuss the '性質' (properties) of a chemical, but you would discuss the '本質' (essence) of human existence or the core truth of a complex problem.

問題の本質を見極める必要がある。(We need to determine the true essence of the problem.)

When discussing human beings, '気質' (kishitsu) is a vital related term. It translates to 'temperament' or 'disposition' and is very close in meaning to the human application of '性質'. However, '気質' often carries a slightly more emotional or psychological weight, referring to the characteristic emotional reactivity of a person, often thought to be biologically based. It is frequently used in phrases like '職人気質' (shokunin katagi - artisan spirit/temperament), where the pronunciation shifts to 'katagi'.

彼は芸術家特有の気質を持っている。(He has a temperament typical of artists.)

性質 vs 気質
気質 is exclusively for humans/animals and focuses heavily on emotional temperament.
We must also revisit '性格' (seikaku - personality) and '特徴' (tokuchou - feature), as they are part of this semantic family. As previously discussed, '性格' is the everyday personality of a person, and '特徴' is a noticeable point or feature.

彼女の性格は明るい。(Her personality is cheerful.)

Finally, '属性' (zokusei) is a term worth knowing, especially for gamers and programmers. It translates to 'attribute' or 'property' in a categorical sense. In a video game, a character might have a fire '属性' (attribute), or in a database, a file has certain '属性' (properties like read-only).

このファイルの属性を変更する。(Change the attributes of this file.)

性質 vs 属性
属性 is used for categorical attributes, often in IT or gaming, whereas 性質 is for physical/natural properties.
By understanding this spectrum of vocabulary, you can choose the exact word needed to convey your thoughts with absolute precision.

How Formal Is It?

Difficulty Rating

Grammar to Know

Noun + の + Noun (水の性質)

Verb (dictionary form) + 性質がある (燃える性質がある)

Noun + 上 (性質上 - suffix indicating 'from the standpoint of' or 'due to')

Adjective + 性質 (穏やかな性質)

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Examples by Level

1

これは水の性質です。

This is a property of water.

Noun + の + 性質

2

犬の性質を知る。

To know the nature of dogs.

Noun + の + 性質

3

良い性質ですね。

That's a good nature/property, isn't it?

Adjective + 性質

4

性質が違います。

The properties are different.

性質 + が + Verb

5

どんな性質ですか？

What kind of property is it?

Question word + 性質

6

猫の性質が好きです。

I like the nature of cats.

性質 + が + 好き

7

性質を学びます。

I will learn the properties.

性質 + を + Verb

8

同じ性質です。

It is the same property.

同じ + 性質

1

この薬は眠くなる性質があります。

This medicine has the property of making you sleepy.

Verb (dictionary form) + 性質がある

2

彼の性質はとても穏やかです。

His disposition is very gentle.

性質 + は + Adjective

3

それは火に弱い性質を持っています。

It has a property of being weak to fire.

性質 + を + 持っている

4

動物の性質について本を読みました。

I read a book about the nature of animals.

性質 + について

5

この二つの物質は性質が似ている。

These two substances have similar properties.

性質 + が + 似ている

6

仕事の性質上、夜遅くなります。

Due to the nature of the job, it gets late at night.

Noun + の + 性質上

7

悪い性質を直したいです。

I want to fix my bad disposition.

Adjective + 性質 + を + Verb

8

プラスチックの性質を調べましょう。

Let's investigate the properties of plastic.

性質 + を + 調べる

1

この化学物質は空気に触れると燃える性質がある。

This chemical has the property of burning when it touches the air.

Complex clause + 性質がある

2

あの人は少し性質が悪いから、あまり関わらない方がいい。

That person has a somewhat nasty nature, so it's better not to get too involved.

性質が悪い (Idiom)

3

情報の性質上、外部には絶対に漏らせません。

Due to the nature of the information, we absolutely cannot leak it to the outside.

性質上 used for formal reasoning

4

それぞれの言語には独自の性質があります。

Each language has its own unique properties.

独自の + 性質

5

この問題の性質を正しく理解することが解決への第一歩だ。

Correctly understanding the nature of this problem is the first step toward a solution.

性質 + を + 理解する

6

彼は生まれつき怒りっぽい性質を持っているようだ。

He seems to have an innately irritable disposition.

生まれつき + Adjective + 性質

7

光の性質を利用した新しい技術が開発された。

A new technology utilizing the properties of light has been developed.

性質 + を + 利用する

8

その二つの事件は、全く異なる性質のものである。

Those two incidents are of a completely different nature.

異なる + 性質 + のもの

1

ウイルスの変異しやすい性質が、ワクチン開発を困難にしている。

The virus's property of mutating easily makes vaccine development difficult.

Verb phrase modifying 性質 as the subject

2

インターネットというメディアの性質上、フェイクニュースは拡散しやすい。

Due to the nature of the medium called the internet, fake news spreads easily.

Noun + という + Noun + の + 性質上

3

彼の発言は、単なる冗談ではなく、悪意を帯びた性質のものだった。

His remarks were not merely a joke, but of a malicious nature.

Noun phrase + 性質のもの

4

この素材は熱伝導率が高いという物理的性質を有している。

This material possesses the physical property of having high thermal conductivity.

物理的性質 + を + 有する (Formal verb)

5

人間の心理的性質を巧みに利用したマーケティング手法だ。

It is a marketing method that skillfully utilizes the psychological nature of humans.

心理的性質 (Psychological nature)

6

そのクレームは、製品の欠陥ではなく、顧客の誤解に起因する性質のものだ。

That complaint is of a nature originating from the customer's misunderstanding, not a product defect.

Verb phrase + 性質のもの

7

この植物は乾燥に強いという特異な性質を備えている。

This plant is equipped with the unique property of being highly resistant to drought.

特異な性質 + を + 備える

8

事態の性質を見極め、慎重に対処する必要がある。

It is necessary to ascertain the nature of the situation and deal with it carefully.

性質 + を + 見極める

1

量子力学において、光は粒子と波の二重の性質を併せ持つと定義される。

In quantum mechanics, light is defined as possessing the dual nature of both a particle and a wave.

二重の性質 + を + 併せ持つ

2

当該契約の性質上、一方的な破棄は法的な制裁を伴う可能性が高い。

Given the nature of the contract in question, unilateral termination is highly likely to entail legal sanctions.

当該 + Noun + の + 性質上 (Highly formal/legal)

3

彼の文学作品は、人間の根源的な孤独を浮き彫りにする性質を帯びている。

His literary works take on a nature that highlights the fundamental loneliness of human beings.

性質 + を + 帯びる

4

この種の金融商品は、ハイリスク・ハイリターンという投機的性質が極めて強い。

This type of financial product has an extremely strong speculative nature of high risk and high return.

投機的性質 + が + 強い

5

行政処分の性質を有する行為については、厳格な手続きが求められる。

For actions possessing the nature of administrative dispositions, strict procedures are required.

性質 + を + 有する + Noun

6

その病気は進行が遅いものの、一度発症すると完治が難しいという厄介な性質がある。

Although the disease progresses slowly, it has the troublesome property of being difficult to cure completely once it manifests.

厄介な性質 + がある

7

言語の恣意性という性質は、ソシュール言語学の根幹を成す概念である。

The property of the arbitrariness of language is a concept that forms the foundation of Saussurean linguistics.

Noun + という性質

8

事象の表層的な特徴に惑わされず、その背後にある本質的な性質を看破せよ。

Do not be misled by the superficial features of the phenomenon; see through to the essential nature behind it.

本質的な性質 + を + 看破する

1

民主主義という制度は、常に衆愚政治へと堕落する危険性を内包するという脆弱な性質を免れ得ない。

The system of democracy cannot escape the fragile nature of inherently containing the risk of degenerating into mob rule.

脆弱な性質 + を + 免れ得ない

2

彼の哲学は、存在の無根拠性を直視するという、極めてニヒリスティックな性質を底流に持っている。

His philosophy has an extremely nihilistic nature as its undercurrent, facing the groundlessness of existence head-on.

性質 + を + 底流に持つ

3

芸術作品の自律的性質を擁護する立場からは、政治的プロパガンダへの従属は断じて容認できない。

From the standpoint of defending the autonomous nature of artworks, subordination to political propaganda is absolutely unacceptable.

自律的性質 + を + 擁護する

4

エントロピー増大の法則は、宇宙全体を支配する不可逆的な物理的性質である。

The law of increasing entropy is an irreversible physical property that governs the entire universe.

不可逆的な + 物理的性質

5

その法案は、国民の権利を不当に制限する違憲の性質を帯びているとの批判が噴出した。

Criticism erupted that the bill took on an unconstitutional nature, unjustly restricting the rights of the people.

違憲の性質 + を + 帯びる

6

人間の意識の志向的性質を解明することは、現象学における最大の課題の一つである。

Elucidating the intentional nature of human consciousness is one of the greatest challenges in phenomenology.

志向的性質 + を + 解明する

7

資本主義経済は、恐慌と好況を繰り返すという周期的な性質を歴史的に証明してきた。

The capitalist economy has historically proven its cyclical nature of repeating depressions and booms.

周期的な性質 + を + 証明する

8

この化合物の特異な性質は、既存の化学理論のパラダイムシフトを迫るほどのものであった。

The unique properties of this compound were such that they forced a paradigm shift in existing chemical theories.

特異な性質 + が + パラダイムシフトを迫る

Synonyms

性格 特性 属性 特質 持ち味

Antonyms

外見 現象

Common Collocations

性質を持つ (have a property)
性質がある (has a nature)
性質が悪い (bad nature/malicious)
性質を調べる (investigate properties)
性質上 (due to its nature)
化学的性質 (chemical properties)
物理的性質 (physical properties)
性質が異なる (properties differ)
性質を帯びる (take on a nature)
性質を見極める (ascertain the nature)

Common Phrases

業務の性質上 (due to the nature of the work)
問題の性質 (the nature of the problem)
水の性質 (properties of water)
生まれつきの性質 (innate nature)
性質の悪い風邪 (a nasty cold)
同じ性質のもの (things of the same nature)
性質を利用する (utilize the properties)
性質が変わる (the nature changes)
性質を理解する (understand the nature)
特異な性質 (unique properties)

Often Confused With

性質 vs 性格 (seikaku) - Used for human personality, not physical properties.

性質 vs 特徴 (tokuchou) - Used for standout features, not the fundamental nature.

性質 vs 本質 (honshitsu) - Used for the absolute core essence, more philosophical than 性質.

Idioms & Expressions

"性質が悪い (seishitsu ga warui - to be of a malicious or nasty nature, often used for stubborn illnesses or bad people)"
"性質を帯びる (seishitsu o obiru - to take on a certain characteristic or nature)"

Easily Confused

性質 vs

性質 vs

Sentence Patterns

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How to Use It

nuance

性質 implies something inherent and difficult to change, whereas 状態 (joutai) implies a temporary state or condition.

colloquialism

While formal, '性質が悪い' is commonly used in casual speech to describe a nasty cold or a stubborn stain.

Common Mistakes
  • Using 性格 (seikaku) instead of 性質 to describe the properties of inanimate objects or chemicals.
  • Using 特徴 (tokuchou) when referring to fundamental physical laws rather than visual features.
  • Pronouncing it as 'seishin' (精神 - spirit) due to the similar starting sound.
  • Using 性質 directly as an adjective without the particle の (e.g., saying 性質問題 instead of 性質上の問題).
  • Applying 性質が悪い to a minor, temporary bad mood, when it actually means a deeply ingrained malicious nature.

Tips

Science Contexts

Always default to '性質' when translating 'property' in a scientific context. Whether it's the properties of light, metals, or gases, this is the correct term. Do not use '性格' or '特徴' for chemical reactions.

The Power of 上 (jou)

Master the phrase '性質上' (seishitsujou). It instantly elevates your Japanese to a professional level. Use it in business emails when you need to politely decline something due to systemic limitations.

Insulting with Style

If you want to describe someone as truly malicious, not just in a bad mood, use '性質が悪い'. It implies their core being is nasty. Use this with extreme caution, as it is highly offensive.

Word Families

Learn '性質' alongside '性格' (personality) and '体質' (physical constitution). Grouping these '性' and '質' words together helps solidify the kanji meanings in your brain.

News Comprehension

When reading Japanese news, look out for '性質'. Journalists use it to explain the deeper context of an event or the underlying mechanics of an economic trend. It signals analytical text.

Describing Animals

When talking about the natural behavior of animals (e.g., 'cats are solitary', 'dogs are loyal'), use '性質'. It sounds much more natural than using the human word '性格'.

Essay Structure

In academic writing, defining the '性質' of your subject in the introduction is a standard and effective way to set up your argument. It shows you understand the fundamental parameters of the topic.

Anime Tropes

In fantasy or sci-fi anime, characters often spend time explaining the '性質' of their powers or the enemy's abilities. Listening for this word will help you understand the magic system's rules.

Verb Pairings

Memorize the verbs that pair with '性質'. The most common are '持つ' (to have), 'ある' (to exist/have), and '調べる' (to investigate). Knowing these chunks improves fluency.

Essence vs Property

Remember the difference between '本質' (essence) and '性質' (property). '性質' is what it does or how it behaves; '本質' is what it fundamentally *is* at its absolute core.

Memorize It

Mnemonic

Think of 'Say' (性 - sei) and 'Sheets' (質 - shitsu). Say, what are the properties of these sheets? Are they cotton or silk? That's their SEISHITSU (properties).

Word Origin

Sino-Japanese (Kango)

Cultural Context

Japanese science education heavily emphasizes rote memorization of the '性質' of various elements and compounds from a young age.

In business, '性質上' is a polite, indirect way to say 'no' or explain a limitation without blaming anyone. 'Due to the nature of the system, we cannot do that.'

Practice in Real Life

Real-World Contexts

Conversation Starters

"この素材の性質について教えていただけますか？ (Could you tell me about the properties of this material?)"

"彼の怒りっぽい性質には困っています。(I'm troubled by his irritable nature.)"

"仕事の性質上、出張が多いですか？ (Due to the nature of your work, do you have many business trips?)"

"水と油の性質の違いを知っていますか？ (Do you know the difference in properties between water and oil?)"

"この問題の性質をどう捉えていますか？ (How do you perceive the nature of this problem?)"

Journal Prompts

Describe the '性質' (properties) of your favorite material (e.g., wood, silk, glass).

Write about a time when you had to deal with someone who had a difficult '性質'.

Explain the '性質' of your current job or field of study.

How does the '性質' of the internet affect society today?

Compare the '性質' of cats and dogs.

Frequently Asked Questions

10 questions

Yes, but it has a specific nuance. While '性格' (seikaku) is the standard word for personality, '性質' (seishitsu) refers to a deeper, innate, and often unchangeable disposition. It sounds more analytical. For example, you might say someone has a 'gentle nature' (穏やかな性質) meaning they were born that way. However, for everyday personality descriptions, '性格' is preferred.

'特徴' (tokuchou) means 'feature' or 'characteristic'. It refers to a specific point that stands out and makes something different from others. '性質' (seishitsu) means 'property' or 'nature'. It refers to the fundamental makeup or inherent rules governing how something behaves. A red color is a 特徴 of an apple, but rotting over time is a 性質 of organic matter.

'性質上' (seishitsujou) is a very common and useful phrase meaning 'due to its nature' or 'inherently'. You attach it directly to a noun (usually with 'の' if it's a separate noun, like 仕事の性質上 - due to the nature of the job). It is used to explain why a certain rule, constraint, or outcome is unavoidable because of what the thing fundamentally is.

Absolutely. It is the standard word for 'property' in physics and chemistry. You will frequently see phrases like '化学的性質' (chemical properties) and '物理的性質' (physical properties). If you are reading a Japanese science textbook, you will encounter this word constantly.

Literally, it means 'the nature is bad'. When applied to a person, it means they have a malicious, nasty, or vicious disposition. When applied to a thing, like a disease or a computer virus, it means it is particularly stubborn, difficult to deal with, or highly damaging. It is a strong phrase.

No, '性質' is a noun. To use it to describe something, you must use particles or verbs. For example, you cannot say '性質問題' (seishitsu mondai). You must say '性質上の問題' (seishitsujou no mondai - a problem of nature) or use a relative clause like '性質が異なるもの' (things with different properties).

The pitch accent is Heiban (flat). It starts low on the first mora 'se', goes high on 'i', and stays high for 'shi' and 'tsu'. When a particle like 'ga' is attached, the high pitch continues onto the particle: se-I-SHI-TSU-GA.

The kanji 質 (shitsu) can sometimes be confused with 盾 (tate - shield) or 順 (jun - order) if written quickly, but it is quite distinct due to the two 'axe' radicals (斤) at the top and the 'shell/money' radical (貝) at the bottom. Pay attention to the top half to distinguish it.

Yes, it is very common to use '性質' for abstract concepts. You can talk about the '性質' of a problem, a market, a legal contract, or a social phenomenon. In these cases, it refers to the underlying mechanics, rules, or fundamental truths of that concept.

'属性' (zokusei) translates to 'attribute' and is often used in categorical or digital contexts, like a file's attributes in computing or a character's elemental attribute in a game. '性質' is more about physical, chemical, or natural properties and inherent dispositions in the real world.

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