不ふ明めい

〈事こと〉が不ふ明めいだsomething is unclear/unknown
事じ故この原げん因いんが不ふ明めいだ。
The cause of the accident is unknown.
〈人ひと〉の身み元もとが不ふ明めいだa person's identity is unidentified
発はっ見けんされた遺い体たいの身み元もとは不ふ明めいのままだ。
The identity of the body that was found remains unknown.
〈事こと〉の詳しょう細さいは不ふ明めいthe details of something are unknown
事じ件けんの詳しょう細さいは不ふ明めいのままである。
The details of the incident remain unclear.
自じ分ぶんの不ふ明めいを恥はじるto be ashamed of one's own lack of insight
彼かれは自じ分ぶんの不ふ明めいを恥はじて謝しゃ罪ざいした。
He apologized, ashamed of his own lack of foresight.

Expressions

未み知ちN1sense 1
未知 describes something not yet known that could still be discovered or explored, while 不明 simply states that something is unclear or unidentified.
不ふ詳しょう sense 2
不詳 is a more formal, often bureaucratic way of saying 'details unknown' (as in official records), whereas 不明 is the everyday, broader term.
曖あい昧まいN3sense 1
曖昧 stresses vagueness or ambiguity in meaning or intention, while 不明 focuses on facts or information simply not being known.
不ふ確たしかN1
不明 means 'unknown' or 'unidentified', emphasizing missing information, whereas 不確か emphasizes doubt about reliability.
行方ゆくえ不ふ明めいN3
不明 means 'unknown' or 'unclear' in a broad sense, while 行方不明 specifically refers to a person or thing being missing or unaccounted for.

明めい確かくN3sense 1
明確 means clear and definite, the direct opposite of 不明's sense of being unclear or unknown.
自じ明めいN1
不明 means unclear or unknown, the opposite of 自明's sense of being obviously and undeniably clear.
判はん明めいN1
不明 means a fact remains unknown or unclear, the opposite state of 判明, where the fact has become clear.

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明あきらかN3
不明 means unclear or unknown, the opposite of 明らか, which means clear and obvious.
明めい瞭りょうN1
不明 means unclear or unknown, the opposite state of 明瞭, which means clear and distinct.
明めい白はくN1
不明 means unclear or unknown, contrasting with 明白's sense of something being plainly evident.

未み明めいN1
未明 (the hours just before dawn) is easily mixed up with 不明 (unclear/unknown) despite sharing similar kanji, but the meanings are completely unrelated.

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Compound of 不 (fu, 'not') and 明 (mei, 'clear, bright'). The meaning follows directly from the kanji components.