هذه الصفحة بلغتك

English

فارسی

Deutsch

Español

Français

日本語

한국어

Português

中文

हिन्दी

B1 adjective #1,200 الأكثر شيوعاً 8 دقيقة للقراءة

不明な

fumei na الأكثر شيوعاً #1,200

تدرّب عليها أمثلة ملاحظات ونصائح 不明な في 30 ثانية

الشرح 不明な in your Level:

At the A1 level, you likely know the word 'wakaranai' (I don't know). 'Fumei' is a more advanced version of this concept. While you won't need to use 'fumei' in basic conversations about your hobbies or family, you might see it in very simple contexts like a 'private number' on a phone or a 'missing' item in a game. Think of 'fumei' as the 'official' way to say something is not known. At this stage, just recognize that 'fu' means 'not' and 'mei' means 'clear.' If you see '不明' on a sign or a screen, it means the information is missing or the computer doesn't recognize what you typed. You don't need to worry about the 'na-adjective' grammar yet, just treat it as a label for 'Unknown.' Focus on seeing the kanji and associating it with the English word 'Unknown.' It is a very common label in Japanese apps and websites.

سجّل مجاناً لقراءة الشرح الكامل

By A2, you are starting to use more adjectives. 'Fumei' is a 'na-adjective,' which means it behaves like 'shizuka na' or 'kirei na.' You might use it to describe a reason that is 'unknown' (fumei na riyuu). At this level, you should start noticing 'fumei' in news headlines or weather reports. For example, if a small accident happens and the cause isn't known yet, the news might say 'gen'in fumei' (cause unknown). You can also use it to be slightly more polite when you don't understand something in a classroom setting, though 'wakaranai' is still more common. Start practicing the phrase 'fumei na ten' (unclear points) when you want to ask a teacher a question. This makes you sound more studious and precise. Remember: 'fumei' is for facts, 'wakaranai' is for your own brain's understanding.

سجّل مجاناً لقراءة الشرح الكامل

At the B1 level, 'fumei' becomes a key part of your vocabulary for formal writing and business. You are expected to use 'go-fumei na ten' (unclear points) when communicating with clients or superiors. This is the 'gold standard' for asking 'Do you have any questions?' in a professional way. You should also be able to understand 'fumei' when it appears in compound nouns like 'yukue-fumei' (missing) or 'chosha-fumei' (author unknown). At this stage, you should understand the nuance: 'fumei' is objective. If you say 'The meeting time is fumei,' it implies the time hasn't been decided yet by the organizers. If you say 'The meeting time is wakaranai,' it might just mean you forgot to check your calendar. B1 learners should use 'fumei' to sound more objective and professional in their speech and writing.

At B2, you should be comfortable using 'fumei' in complex sentences and understanding its role in abstract discussions. You will encounter it in literature, legal documents, and advanced news reports. You should be able to distinguish 'fumei' from similar words like 'aimai' (vague) or 'futoumei' (non-transparent). For example, a B2 student should know that a 'fumei na keiyaku' is a contract where some information is missing, while an 'aimai na keiyaku' is a contract where the wording is confusing or could be interpreted in multiple ways. You will also see 'fumei' used in historical contexts, such as 'shousai fumei' (details unknown) when discussing ancient events. Your goal at this level is to use 'fumei' to add a layer of objectivity to your arguments and reports.

سجّل مجاناً لقراءة الشرح الكامل

For C1 learners, 'fumei' is a tool for precision in academic and professional discourse. You will use it to describe gaps in research or data. You should be familiar with its use in specialized fields, such as 'mimoto-fumei' (unidentified) in forensics or 'kansen-keiro-fumei' (unknown infection route) in epidemiology. At this level, you can use 'fumei' to critique the clarity of a text or a speaker's logic. You might say, 'The logical connection between these two points is fumei (unclear),' which is a sophisticated way to point out a flaw in an argument. You should also be able to handle the word in its various grammatical forms, including its use in 'fumei-bun' (unclear sentences) or 'fumei-ryou' (unknown quantity) in mathematics and science. Your mastery of 'fumei' should reflect a deep understanding of Japanese formal registers.

سجّل مجاناً لقراءة الشرح الكامل

At the C2 level, you use 'fumei' with the nuance of a native speaker, often in highly formal or literary contexts. You understand the subtle difference between 'fumei' and 'michi' (the unknown/unexplored) in philosophical discussions. You might use 'fumei' to describe the 'ineffable' or 'unknowable' aspects of human existence in a literary essay. You are also expected to recognize 'fumei' in archaic or highly specialized kanji compounds found in classical literature or high-level legal statutes. At this stage, 'fumei' is not just a word for 'unknown,' but a concept used to define the boundaries of knowledge, transparency, and identification in the Japanese language. You can seamlessly switch between 'fumei,' 'fubun' (unwritten/unknown), and other related terms to achieve the exact rhetorical effect you desire in your speech and writing.

سجّل مجاناً لقراءة الشرح الكامل

تدرّب عليها أمثلة ملاحظات ونصائح

不明な في 30 ثانية

不明な (fumei na) is a formal na-adjective meaning 'unknown' or 'unclear,' used for objective facts rather than personal feelings.
It is commonly found in news reports (e.g., missing persons), business settings (e.g., unclear points), and technical error messages.
Grammatically, it requires 'na' before nouns and 'da/desu' at the end of sentences, but often drops 'na' in compound nouns.
Key phrases include 'fumei na ten' (unclear points) and 'yukue fumei' (whereabouts unknown), which are essential for professional communication.

The Japanese word 不明な (fumei na) is a versatile na-adjective that primarily translates to 'unknown,' 'unclear,' or 'unidentified.' It is composed of two kanji: 不 (fu), meaning 'not' or 'non-', and 明 (mei), meaning 'bright,' 'clear,' or 'evident.' Together, they literally describe a state that is 'not clear' or 'not evident.' This word is essential for moving beyond the basic 'wakaranai' (I don't know) and into more formal, objective, or descriptive Japanese. While 'wakaranai' expresses a personal lack of understanding, 'fumei' describes the objective status of information itself.

Objective Uncertainty: Used when the facts are not available to anyone, such as in news reports or scientific data.
Formal Contexts: Commonly found in business emails, official documents, and academic writing to denote a lack of clarity.

事故の原因は今のところ不明な点が多い。(Jiko no gen'in wa ima no tokoro fumei na ten ga ooi.)

Translation: As for the cause of the accident, there are many unknown points at this time.

In daily life, you might encounter this word on a computer screen when a file format is 'unknown' (不明な形式) or when receiving a call from an 'unidentified' number (番号不明). It carries a nuance of professionalism and precision. If a doctor says a cause is 'fumei,' it sounds like a clinical diagnosis of uncertainty, whereas 'wakaranai' might sound like they simply haven't studied the chart yet. This distinction is crucial for B1 learners who are transitioning from conversational Japanese to more sophisticated situational Japanese.

Furthermore, 'fumei' is often paired with 'ten' (点 - point/aspect) to say 'fumei na ten' (unclear points). This is a polite way to ask for clarification in a business meeting without sounding accusatory. Instead of saying 'I don't understand your explanation,' you can say 'There are some unclear points in the explanation,' which shifts the focus from your lack of understanding to the clarity of the information itself.

Usage in Media: News anchors use this word constantly when reporting on breaking news where details are still emerging.

犯人の動機は依然として不明なままだ。(Hannin no douki wa izen to shite fumei na mama da.)

Translation: The culprit's motive remains unknown.

Using 不明な correctly requires understanding its grammatical role as a na-adjective. This means that when it modifies a noun directly, you must include the particle 'na'. When it ends a sentence, you use 'da' or 'desu'. However, in many formal reports, it is used as a noun-like suffix (e.g., 原因不明 - gen'in fumei) where the 'na' is dropped entirely to create a compound noun.

Attributive Use (Modifying a Noun): [不明な] + [Noun]. Example: 不明な理由 (Unknown reason).
Predicative Use (Ending a Sentence): [Subject] + [wa] + [不明だ/です]. Example: 詳細は不明です (Details are unknown).

この古い地図には、いくつか不明な場所が記載されている。(Kono furui chizu ni wa, ikutsuka fumei na basho ga kisai saretieru.)

Translation: On this old map, several unknown locations are listed.

One of the most common ways you will see this word used is in the phrase '不明な点' (fumei na ten). This is the standard way to say 'unclear points' or 'questions.' In a business setting, if you are reviewing a contract and find something you don't understand, you would say: 'ご不明な点があれば、お知らせください' (Go-fumei na ten ga areba, oshirase kudasai), which means 'If there are any points that are unclear to you, please let us know.' Note the addition of the honorific 'go' (ご) which makes it very polite and professional.

In technical contexts, 'fumei' is used for errors or data gaps. For example, '不明なエラーが発生しました' (An unknown error has occurred) is a phrase every Japanese computer user knows well. It implies that the system cannot identify the specific nature of the problem. Similarly, in history or archaeology, an 'unknown author' is '著者不明' (chosha fumei). Here, the word acts almost like a suffix, indicating a state of being unidentified.

そのウイルスの感染経路は依然として不明なままだ。(Sono uirusu no kansen keiro wa izen to shite fumei na mama da.)

Translation: The infection route of that virus remains unknown.

You will encounter 不明な in a variety of real-world scenarios, ranging from the evening news to your smartphone settings. It is a 'high-frequency' word in formal and semi-formal Japanese. Understanding where it appears helps you grasp its tone—which is usually serious, objective, and slightly detached.

News and Journalism: Journalists use 'fumei' to report on missing persons (行方不明), unknown causes of death (死因不明), or unidentified flying objects (正体不明の飛行物体).
Customer Service and Business: Staff will ask if you have 'go-fumei na ten' (unclear points) regarding a service or product. It is the polite way to ask 'Do you have any questions?'

「ご不明な点がございましたら、お気軽にお尋ねください。」(Go-fumei na ten ga gozaimashitara, o-kigaru ni o-tazune kudasai.)

Translation: If you have any unclear points, please feel free to ask.

In the digital world, 'fumei' is the standard translation for 'Unknown.' If you look at your call history and see a call from a private number, it will often say '番号非通知' (number withheld) or '不明な発信者' (unknown caller). In software development, 'unknown variables' or 'unknown types' are always labeled with 'fumei.' This usage highlights the word's role in categorizing things that fall outside of known parameters.

You might also hear it in academic lectures or documentaries. A historian might discuss an 'unknown era' (不明な時代) or a scientist might talk about 'unknown substances' (不明な物質). In these cases, the word lends an air of mystery and intellectual honesty—acknowledging the limits of current human knowledge. It is less about 'I don't know' and more about 'It is not yet known to science.'

警察は、身元不明な遺体の身元確認を急いでいる。(Keisatsu wa, mimoto fumei na itai no mimoto kakunin o isoide iru.)

Translation: The police are rushing to identify the unidentified body.

While 不明な is a relatively straightforward word, English speakers often make mistakes by using it where 'wakaranai' or 'shiranai' would be more appropriate. The most common error is using 'fumei' to describe a personal lack of knowledge about something that is generally known. For example, if you don't know where the bathroom is, you wouldn't say 'Toire wa fumei desu.' That would imply the bathroom's location is a mystery to the entire world.

Personal vs. Objective: Mistake: Using 'fumei' for 'I don't know' (personal). Correct: Use 'wakaranai' or 'shiranai'.
Adjective Type Confusion: Mistake: Treating it like an i-adjective (e.g., *fumei-i). Correct: It is a na-adjective (fumei-na).

❌ 彼の名前は私にとって不明なです。(Kare no namae wa watashi ni totte fumei na desu.)

Correction: Names are usually 'shiranai' (unknown to me). 'Fumei' is too heavy here.

Another mistake is forgetting the 'na' when modifying a noun. Because 'fumei' is often seen in compound nouns like '原因不明' (gen'in fumei), learners might think they can just say 'fumei riyuu.' However, if you are using it as an adjective, you must say '不明な理由.' The compound noun form is a specific grammatical construction used mostly in writing and formal reports.

Lastly, avoid using 'fumei' in very casual settings with friends. It sounds overly stiff and clinical. If a friend asks you why you're late, saying 'Riyuu wa fumei desu' (The reason is unknown) sounds like you're reading a police report about yourself. In that case, 'Chotto wakan'nai' or 'Riyuu wa nai yo' would be much more natural.

❌ 明日の天気は不明なです。(Ashita no tenki wa fumei na desu.)

Correction: Use 'wakaranai' or 'yosou ga tsukanai' (cannot predict). 'Fumei' is for facts, not forecasts.

Japanese has several words that overlap with 不明な, and choosing the right one depends on the level of certainty and the context. While 'fumei' is the most general term for 'unknown,' others like 'aimai,' 'fumeiryou,' and 'mishirazu' offer different shades of meaning.

曖昧な (Aimai na): Means 'vague' or 'ambiguous.' Use this when the information exists but is not clearly defined or is intentionally fuzzy.
不透明な (Futoumei na): Literally 'opaque' or 'non-transparent.' Often used for political or financial situations where things are being hidden.
未知の (Michi no): Means 'unknown' in the sense of 'undiscovered' or 'new to humanity' (e.g., an unknown planet).

彼の返事は曖昧なものだった。(Kare no henji wa aimai na mono datta.)

Comparison: Here, 'aimai' is better than 'fumei' because the answer was given, but it wasn't clear.

Another important distinction is 不鮮明な (fusenmei na), which means 'blurred' or 'not vivid.' You would use this for a blurry photograph or a weak radio signal. While 'fumei' means the identity or cause is unknown, 'fusenmei' means the visual or auditory quality is poor. Then there is 未確認の (mikakunin no), which means 'unconfirmed.' This is used when there is a report or a sighting, but it hasn't been officially verified yet (like a UFO - 未確認飛行物体).

Finally, consider 謎 (nazo), which means 'mystery.' While 'fumei' is a clinical adjective, 'nazo' is a noun that adds a sense of intrigue or drama. 'The cause is unknown' (原因は不明だ) sounds like a report; 'The cause is a mystery' (原因は謎だ) sounds like the start of a detective novel. Choosing between these words allows you to control the emotional weight of your sentence.

宇宙にはまだ多くの未知の領域がある。(Uchuu ni wa mada ooku no michi no ryouiki ga aru.)

Comparison: 'Michi' is used here because space is an unexplored frontier.

How Formal Is It?

حقيقة ممتعة

The kanji for 'mei' (明) is made of 'sun' (日) and 'moon' (月). It's hard to get clearer than the sun and moon together! Adding '不' completely negates that ultimate clarity.

دليل النطق

UK ɸɯᵝmeː na

US fu-may nah

The pitch accent is 'Heiban' (flat). The pitch starts low and rises, staying high through 'mei' and 'na'.

يتقافى مع

Unmei (Destiny) Seimei (Life) Komei (Fame) Toumei (Transparent) Shoumei (Proof) Kumei (Empty name) Yumei (Famous) Tenmei (Heaven's will)

أخطاء شائعة

Pronouncing 'fu' like an English 'f' with teeth on lips.
Shortening the 'mei' to 'me'. It must be a long vowel.
Stress-accenting one syllable like English; Japanese uses pitch, not volume.
Forgetting the 'na' when it's an adjective.
Misreading the kanji '明' as 'aka' instead of 'mei'.

مستوى الصعوبة

القراءة 3/5

The kanji are common, but learners must remember the 'mei' reading instead of 'aka'.

الكتابة 3/5

Writing 'mei' (明) is easy, but 'fu' (不) requires correct stroke order for the bottom part.

التحدث 2/5

Pronunciation is simple, but using it instead of 'wakaranai' takes practice.

الاستماع 2/5

Very distinct sound; easy to pick out in news broadcasts.

ماذا تتعلّم بعد ذلك

المتطلبات الأساسية

分かる (Wakaru) 知る (Shiru) 明るい (Akarui) 理由 (Riyuu) 原因 (Gen'in)

تعلّم لاحقاً

明確な (Meikaku na) 曖昧な (Aimai na) 詳細 (Shousai) 確認する (Kakunin suru) 判明する (Hanmei suru)

متقدم

五里霧中 (Gorimuchuu) 不透明 (Futoumei) 未確認 (Mikakunin) 不可解 (Fukakai) 謎めいた (Nazomeita)

قواعد يجب معرفتها

Na-Adjective Modification

不明な理由 (Fumei na riyuu) - Unknown reason.

Noun + 不明 (Compound Nouns)

原因不明 (Gen'in fumei) - Cause unknown.

Honorific 'Go' with Na-Adjectives

ご不明な点 (Go-fumei na ten) - Unclear points (polite).

State of Being '...mama'

不明なまま (Fumei na mama) - Remaining unknown.

Negative form of Na-Adjectives

不明ではない (Fumei dewa nai) - Not unknown.

سجّل مجاناً لقراءة الشرح الكامل

أمثلة حسب المستوى

名前が不明です。

The name is unknown.

Simple predicative use with 'desu'.

不明な電話番号。

An unknown phone number.

Attributive use modifying 'denwa bangou'.

理由は不明です。

The reason is unknown.

Subject 'riyuu' followed by 'wa' and 'fumei'.

不明なエラー。

Unknown error.

Common technical phrase.

場所は不明だ。

The location is unknown.

Casual predicative use with 'da'.

不明なファイル。

Unknown file.

Directly modifying 'fairu'.

作者は不明です。

The author is unknown.

Used for unidentified creators.

不明な点があります。

There are unknown points.

Using 'arimasu' to show existence.

原因不明の病気。

An illness of unknown cause.

Compound noun 'gen'in-fumei' modifying 'byouki'.

不明な点を聞いてください。

Please ask about unclear points.

Imperative 'kiite kudasai' with 'fumei na ten'.

彼は行方不明になった。

He went missing.

Set phrase 'yukue-fumei' meaning whereabouts unknown.

詳細はまだ不明です。

Details are still unknown.

Adding 'mada' (still) for emphasis.

不明な言葉を調べます。

I will look up unknown words.

Verb 'shirabemasu' (to look up).

送り主が不明な荷物。

A package with an unknown sender.

Relative clause 'okurinushi ga fumei na' modifying 'nimotsu'.

不明な点を確認します。

I will confirm the unclear points.

Verb 'kakunin shimasu' (to confirm).

身元不明の男性。

An unidentified man.

Compound 'mimoto-fumei' (identity unknown).

ご不明な点があれば、お知らせください。

If you have any unclear points, please let us know.

Honorific 'go' and conditional 'areba'.

その事件には不明な点が多い。

There are many unknown points in that case.

Using 'ooi' (many) to describe 'fumei na ten'.

データの出典が不明なため、使えません。

Since the source of the data is unknown, we cannot use it.

Using '...tame' to indicate a reason.

犯人の動機は依然として不明だ。

The culprit's motive remains unknown.

Formal adverb 'izen to shite' (still/as before).

不明な点について質問してもいいですか？

May I ask a question about the unclear points?

Asking permission with '...te mo ii desu ka'.

この文書には不明な表現が含まれている。

This document contains unclear expressions.

Passive verb 'fukumarete iru' (is contained).

行き先が不明な旅に出る。

To go on a trip with an unknown destination.

Noun 'ikisaki' (destination).

不明な請求書が届いた。

An unknown invoice arrived.

Noun 'seikyuusho' (invoice/bill).

その理論には、まだ不明な要素が残されている。

In that theory, unknown elements still remain.

Passive potential 'nokosarete iru'.

不透明な資金の流れが、不明な支出を生んでいる。

The non-transparent flow of funds is creating unknown expenditures.

Contrasting 'futoumei' and 'fumei'.

著者の意図が不明なまま、議論が進んでいる。

The discussion is proceeding while the author's intent remains unknown.

Using '...mama' to show a continuing state.

この遺跡の正確な年代は不明な点が多い。

There are many unknown points regarding the exact age of these ruins.

Noun 'nendai' (era/age).

不明な点を一つずつ潰していく必要がある。

It is necessary to eliminate the unknown points one by one.

Metaphorical use of 'tsubusu' (to crush/eliminate).

そのウイルスは感染経路が不明なため、対策が難しい。

Because the virus's infection route is unknown, countermeasures are difficult.

Causal '...tame' in a complex sentence.

身元不明の遺体が発見されたとのニュースが入った。

News came in that an unidentified body was discovered.

Reported speech '...to no nyuusu'.

不明な点があれば、後ほどメールで回答します。

If there are unclear points, I will reply by email later.

Formal future intention.

歴史の闇に葬られた、不明な真実を探求する。

To explore the unknown truths buried in the darkness of history.

Literary expression 'yami ni houmurareta'.

統計的に有意ではあるが、その因果関係は依然として不明なままである。

While statistically significant, the causal relationship remains unknown.

Academic phrasing 'toukeiteki ni yuui'.

不明な点を放置することは、プロジェクトの失敗に直結する。

Leaving unclear points unaddressed leads directly to project failure.

Noun 'houchi' (leaving as is/neglecting).

その古文書の成立過程には、不明な部分が多々見受けられる。

In the process of that ancient document's formation, many unknown parts are observed.

Formal verb 'miukerareru' (to be seen/observed).

不明な事象を科学的に解明するのが我々の使命だ。

It is our mission to scientifically clarify unknown phenomena.

Noun 'jishou' (phenomenon/event).

契約書の不明な条項が、後の法的紛争の火種となった。

The unclear clauses in the contract became the spark for later legal disputes.

Metaphorical 'hidane' (spark/source of trouble).

宇宙の膨張速度に関する不明な変数が、新たな理論を求めている。

Unknown variables regarding the expansion rate of the universe call for a new theory.

Scientific term 'hensuu' (variable).

不明な点が多い中での決断は、大きなリスクを伴う。

Making a decision amidst many unknown points carries a great risk.

Using '...naka de no' to show circumstances.

万物の根源には、人知の及ばぬ不明な領域が横たわっている。

At the root of all things lies an unknown realm beyond human knowledge.

Poetic 'jinchi no oyobanu' (beyond human intellect).

不明な点の一切を排除した完璧な論理を構築するのは不可能に近い。

It is nearly impossible to construct a perfect logic that excludes all unknown points.

Noun 'issai' (all/everything).

その哲学者の思想には、解釈が不明な断片が数多く含まれている。

The philosopher's thoughts contain many fragments whose interpretation is unknown.

Noun 'danpen' (fragments).

不明な因子の介在を否定できない以上、この結論は暫定的なものに過ぎない。

As long as the intervention of unknown factors cannot be denied, this conclusion is merely provisional.

Logical connector '...ijou' (since/as long as).

不明な起源を持つその言語は、言語学上の大きな謎とされている。

That language, which has an unknown origin, is considered a great linguistic mystery.

Passive '...to sarete iru' (is considered to be).

不明な動機に基づく行動は、しばしば社会的な混乱を招く。

Actions based on unknown motives often lead to social chaos.

Verb 'maneku' (to invite/bring about).

その政策の波及効果は依然として不明な部分が多く、慎重な議論を要する。

The ripple effects of that policy still have many unknown parts, requiring careful discussion.

Noun 'hakyuu kouka' (ripple effect).

不明な点があれば、即座に原典に立ち返って確認すべきである。

If there are unclear points, one should immediately return to the original source to confirm.

Formal '...subeki de aru' (should/ought to).

تلازمات شائعة

不明な点

原因不明

行方不明

身元不明

詳細不明

著者不明

不明なエラー

正体不明

生死不明

国籍不明

العبارات الشائعة

ご不明な点があれば

— If there are any points that are unclear to you. Standard polite business opening.

ご不明な点があれば、いつでもご連絡ください。

依然として不明

— Remains unknown. Used in news to say no progress has been made in finding out the truth.

動機は依然として不明です。

今のところ不明

— Unknown for the time being. Suggests that it might become known later.

被害の大きさは今のところ不明です。

一切不明

— Completely unknown. Emphasizes that absolutely no information is available.

彼の過去については一切不明だ。

詳細は不明

— Details are unknown. Used when the general idea is known but the specifics are not.

結婚の噂はあるが、詳細は不明だ。

所在不明

— Whereabouts unknown (often for documents or assets). Similar to yukue-fumei but less personal.

重要書類が所在不明になっている。

出所不明

— Unknown source. Used for money, rumors, or information of questionable origin.

出所不明の資金が流れ込んでいる。

意味不明

— Meaningless or nonsensical. Often used as a slangy way to say 'What you're saying makes no sense.'

彼の言動は意味不明だ。

安否不明

— Safety unknown. Used after natural disasters to refer to people who haven't been contacted.

地震の後、多くの人の安否が不明だ。

氏名不明

— Name unknown. Used in official records when a person's name is not recorded.

氏名不明の寄付者。

يُخلط عادةً مع

不明な vs 分からない (Wakaranai)

Personal lack of understanding vs. objective lack of info.

不明な vs 知らない (Shiranai)

Personal lack of knowledge/familiarity vs. objective lack of info.

不明な vs 曖昧 (Aimai)

Vague/Ambiguous vs. Unknown/Unclear.

تعبيرات اصطلاحية

"行方不明になる"

— To go missing or disappear without a trace. This is the most common idiomatic use.

飼い猫が行方不明になった。

Neutral

"意味不明なことを言う"

— To talk nonsense or say things that don't make sense. Can be used as a light insult.

酔っ払って意味不明なことを言っている。

Informal

"正体不明の"

— Unidentified or mysterious. Often used for monsters, UFOs, or strangers.

正体不明の人物から手紙が届いた。

Neutral

"原因不明の"

— Of unknown cause. Frequently used in medical or mechanical contexts.

原因不明の頭痛に悩まされている。

Neutral

"五里霧中"

— Being totally at a loss; all at sea. While not using 'fumei,' it describes a state of total 'fumei.'

計画は五里霧中の状態だ。

Formal/Idiomatic

"身元不明"

— Unidentified (identity unknown). Used for bodies or people without ID.

身元不明の遺体が収容された。

Formal

"詳細不明につき"

— Since details are unknown. A formal way to defer a decision or explanation.

詳細不明につき、回答を控えます。

Very Formal

"不明の至り"

— Being extremely ashamed of one's lack of insight or judgment. A very formal apology.

私の不明の至りで、ご迷惑をおかけしました。

Archaic/Very Formal

"生死不明"

— Whether one is dead or alive is unknown.

遭難者の多くがいまだに生死不明だ。

Formal

"音信不通"

— Having no contact/hearing nothing from someone. Related to being 'fumei' in communication.

卒業以来、彼とは音信不通だ。

Neutral

سهل الخلط

不明な vs 不透明 (Futoumei)

Both start with 'Fu' and mean something isn't clear.

'Fumei' is about information being unknown. 'Futoumei' is about a process lacking transparency or being 'cloudy'.

不透明な政治 (Opaque politics) vs 不明な理由 (Unknown reason).

不明な vs 未確認 (Mikakunin)

Both imply something isn't known for sure.

'Mikakunin' means it hasn't been confirmed yet, but might exist. 'Fumei' means the identity or cause is simply not known.

未確認の情報 (Unconfirmed info) vs 不明な情報 (Unknown info).

不明な vs 不鮮明 (Fusenmei)

Both use the kanji 'mei' and mean 'not clear'.

'Fusenmei' is specifically for physical clarity (vision/sound). 'Fumei' is for intellectual clarity (facts/identity).

不鮮明な写真 (Blurry photo) vs 不明な人物 (Unknown person).

不明な vs 未知 (Michi)

Both translate to 'unknown'.

'Michi' is for things never discovered or explored (like a new planet). 'Fumei' is for things that should be known but aren't (like a missing person).

未知の世界 (Unknown world) vs 行方不明 (Missing person).

不明な vs 不可解 (Fukakai)

Both mean you can't understand it.

'Fukakai' implies it's baffling or mysterious. 'Fumei' is just a dry statement of fact.

不可解な事件 (A baffling case) vs 原因不明の事件 (A case of unknown cause).

أنماط الجُمل

[Noun] は不明です。

名前は不明です。

不明な [Noun] を [Verb]。

不明な点を確認します。

ご不明な点があれば、[Verb]。

ご不明な点があれば、教えてください。

[Noun]不明の [Noun]。

原因不明の故障です。

[Subject] は依然として不明だ。

犯人の動機は依然として不明だ。

[Noun] が不明なため、[Result]。

住所が不明なため、荷物が届きません。

不明な [Noun] が多々見受けられる。

不明な点が多々見受けられる。

不明な [Noun] の介在を否定できない。

不明な因子の介在を否定できない。

عائلة الكلمة

الأسماء

不明 (Fumei) - Lack of clarity/Unknown state

不明瞭 (Fumeiryou) - Indistinctness/Lack of clarity

الأفعال

判明する (Hanmei suru) - To become clear/To be identified

明かす (Akasu) - To reveal/To make clear

الصفات

明確な (Meikaku na) - Clear/Definite

明白な (Meihaku na) - Obvious

明るい (Akarui) - Bright/Cheerful

مرتبط

不 (Fu) - Prefix for 'not'

明 (Mei) - Kanji for 'clear'

知る (Shiru) - To know

分かる (Wakaru) - To understand

謎 (Nazo) - Mystery

سجّل مجاناً لرؤية جميع الأمثلة

كيفية الاستخدام

frequency

Highly frequent in formal, technical, and media contexts. Low frequency in casual family conversation.

أخطاء شائعة

Using 'fumei' for personal ignorance. → Use 'wakaranai' or 'shiranai'.
Saying 'Toire wa fumei desu' sounds like the toilet's location is a mystery to all of humanity, not just that you don't know where it is.
Treating 'fumei' as an i-adjective. → Use 'fumei na' or 'fumei desu'.
Never say 'fumei-i' or 'fumeikunai'. It is a na-adjective, so it follows na-adjective rules.
Forgetting the 'go' in business contexts. → Use 'go-fumei na ten'.
In business, 'fumei na ten' is too direct. Adding 'go' (ご) makes it appropriately polite for customers or bosses.
Using 'fumei' for blurry images. → Use 'fusenmei' (不鮮明).
'Fumei' is for facts/identity. 'Fusenmei' is for physical clarity of sight or sound.
Using 'fumei' for undecided future plans. → Use 'mitei' (未定) or 'fukakutei' (不確定).
'Fumei' is for things that are already true but unknown. 'Mitei' is for things that haven't been decided yet.

نصائح

Don't forget the 'na'

When 'fumei' comes before a noun, you must use 'na'. Example: '不明な理由' (fumei na riyuu). Without 'na', it's grammatically incorrect unless it's a set compound like '原因不明'.

Use it to save face

Using 'go-fumei na ten' (unclear points) instead of 'wakaranai' (I don't understand) helps maintain a professional atmosphere and doesn't make anyone look bad.

Watch the News

The best way to hear 'fumei' in action is to watch Japanese news. It appears in almost every broadcast regarding accidents, crimes, or international events.

Compound Nouns

In formal writing, you can create your own compounds by putting a noun before '不明'. For example, '年齢不明' (age unknown) or '国籍不明' (nationality unknown).

Imi-fu

If you want to sound like a native teenager on social media, use '意味不' (imi-fu) when you see something weird. It's very common in text speak.

Fumei vs. Nazo

Use 'fumei' for dry, objective facts (like a report). Use 'nazo' for things that are exciting, scary, or truly mysterious.

Business Emails

Always include 'ご不明な点がございましたら...' at the end of your business emails. it's a standard polite closing that Japanese professionals expect.

Kanji Breakdown

Remember: 不 (Not) + 明 (Clear). If you can't remember the word, just look at the kanji and think 'Not Clear'.

Pitch Accent

Keep your voice steady and flat (Heiban). Don't drop the pitch at the end of 'fumei' like you might in English.

Level Up

Transitioning from 'wakaranai' to 'fumei' is a sign you are moving from a beginner (A2) to an intermediate (B1) level of Japanese.

احفظها

وسيلة تذكّر

Think of 'Fu' as 'Full of' and 'Mei' as 'Mystery'. If something is 'Fumei', it is 'Full of Mystery' because it is unknown!

ربط بصري

Imagine a dark room where you can't see anything. The light (明) is 'not' (不) there. Everything is 'fumei'.

Word Web

Unknown Unclear Missing Unidentified Mystery Formal Objective Not bright

تحدٍّ

Try to find three things in your house today that are 'fumei' (e.g., an old key, a mysterious stain, or the author of a note) and label them in your head as 'fumei na mono'.

أصل الكلمة

The word comes from Middle Chinese roots. '不' (fu) is a negative prefix meaning 'not'. '明' (mei) represents the sun and moon together, symbolizing clarity and light. Thus, 'fumei' literally means 'not bright' or 'not clear'.

المعنى الأصلي: In ancient texts, it referred to a lack of wisdom or insight (spiritual darkness), but evolved to mean an objective lack of information.

Sino-Japanese (Kango)

السياق الثقافي

Be careful using 'yukue fumei' (missing person) as it is a serious term used for tragedies like kidnappings or natural disasters.

English speakers often use 'I don't know' for everything. In Japanese, you must distinguish between personal ignorance (wakaranai) and objective lack of info (fumei).

行方不明 (Yukue Fumei) - A common trope in Japanese mystery novels and anime (e.g., Erased). 意味不明 (Imi Fumei) - Often used in internet slang (abbreviated as 'imi-fu') to react to weird memes. 身元不明 (Mimoto Fumei) - The title of various Japanese crime dramas.

تدرّب في الحياة الواقعية

سياقات واقعية

Business Meetings

ご不明な点はありますか？
不明な点を確認させてください。
詳細は今のところ不明です。
不明な点があればメールしてください。

News Reports

犯人の行方は不明です。
原因は調査中ですが、現在は不明です。
身元不明の男性が保護されました。
安否不明者の捜索が続いています。

Technology/IT

不明なエラーが発生しました。
不明なデバイスが接続されました。
不明なファイル形式です。
ソースコードの不明な箇所を修正する。

Academic Research

この事象のメカニズムは不明である。
不明な変数を排除する。
著者は不明とされている。
不明な点が多いが、仮説を立てる。

Daily Life (Formal)

不明な番号からの電話。
送り主不明の郵便物。
理由不明のキャンセル。
場所が不明で迷った。

بدايات محادثة

"この説明書で、何かご不明な点はありますか？ (Are there any unclear points in this manual?)"

"昨日のニュースで見た、行方不明のニュース知ってる？ (Do you know about the missing person news from yesterday?)"

"この古い写真、誰が撮ったか不明なんだって。 (I heard it's unknown who took this old photo.)"

"最近、原因不明の体調不良が続いていて困るよ。 (I'm troubled because I've been having health issues of unknown cause lately.)"

"意味不明なメールが届いたんだけど、どう思う？ (I got a nonsensical email; what do you think?)"

مواضيع للكتابة اليومية

今日、仕事や勉強で「不明な点」がありましたか？それをどうやって解決しましたか？ (Were there any 'unclear points' in your work or study today? How did you solve them?)

あなたが一番「謎（不明なこと）」だと思うことは何ですか？ (What is the thing you find most 'mysterious/unknown'?)

「行方不明」になった大切なものを探した経験はありますか？ (Have you ever searched for something important that went 'missing'?)

もし「正体不明」の人物から手紙が届いたら、あなたはどうしますか？ (If you received a letter from an 'unidentified' person, what would you do?)

「意味不明」な行動をしてしまったことはありますか？その時の状況を書いてください。 (Have you ever done something 'nonsensical'? Please write about the situation.)

الأسئلة الشائعة

10 أسئلة

Only in a very formal context, like a police report. In normal conversation, say 'Namae wa shirimasen' or 'Namae wa wakarimasen.' Using 'fumei' makes it sound like the person's name is a state secret or a clinical mystery.

'Fumei' means unknown. 'Fumeiryou' (不明瞭) means indistinct or not clearly articulated. For example, if someone is mumbling, their speech is 'fumeiryou.' If you don't know who is speaking, the speaker is 'fumei.'

Yes, grammatically it is a na-adjective. However, it is very frequently used as part of a compound noun (like 原因不明) where the 'na' is not needed. When it stands alone as an adjective, you must use 'na'.

The standard phrase is '不明なエラー' (fumei na eraa). You will see this on computers and smartphones constantly.

Yes, but it usually refers to their identity (mimoto fumei) or their whereabouts (yukue fumei). You wouldn't call a person 'fumei na hito' to mean they are mysterious; you would use 'nazo no hito' or 'fushigi na hito' instead.

It's a slang abbreviation of 'imi fumei' (meaning unknown). Young people use it when someone says something weird or when they see something nonsensical. It's similar to saying 'WTF' or 'That makes no sense' in English.

It is a neutral, formal word. To make it polite when talking to a customer, you add 'go' to make 'go-fumei.' By itself, it is professional but not necessarily 'honorific.'

Use it at the end of a presentation, in a business email, or when a teacher finishes explaining something. It's the most natural way to ask 'Are there any questions?' or 'Is there anything you didn't understand?'

It literally means 'whereabouts unknown.' It is the standard Japanese term for a 'missing person.' You will see it in news reports about people lost in the mountains or after a disaster.

Not usually. For the future, we use 'mitei' (undecided) or 'fukakutei' (uncertain). 'Fumei' is for facts that exist now but aren't known, or historical facts that are lost.

سجّل مجاناً للنصائح والملاحظات