不同|ふどうfudou[0]heiban (flat)

1. na-adjective, no-adjectivedifference; diversity; irregularity; disorder

• Synonym差異さいWrittenWritten/formal prose for a difference found by comparing things, as in 「差異化」; leans toward objective comparison.
• Synonym相違そういWrittenWritten/formal prose for being different or not matching, as in 「事実と相違する」 or 「意見の相違」.
• Synonym差さNeutralA margin or difference in amount, as in 「温度差」; stresses numerical difference.
• Synonym不一致ふいっちNeutralLack of agreement or match, as in 「意見の不一致」; close in sense to 「不同」.
• Related食い違いくいちがいNeutralUsed when two accounts or opinions fail to match; fine in both speech and writing. 「不同」 instead stresses things being out of order or not uniform.
• RelatedずれNeutralColloquial for a shift or offset — views or positions out of line, as in 「認識のずれ」.
• Related違いちがいNeutralThe most general word for a difference. 「不同」 now mostly appears in fixed expressions like 「順不同」.
• RelatedひらきNeutralA gap or spread between two things, as in 「実力の開き」 or 「点差の開き」; focuses on the size of the gap.
• Related不統一ふとういつWrittenWritten/formal prose for lack of uniformity, as in 「表記の不統一」.
• Related齟齬そごWrittenWritten/formal prose for two sides failing to match or having discrepancies, as in 「認識の齟齬」.
• Related不等ふとうWrittenWritten/formal prose for being unequal, as in the math term 「不等式」.
• Related径庭けいていWrittenWritten/formal prose for a vast difference; mostly in the negative 「径庭はない」, and rarely used.
• Related異同いどうWrittenWritten/formal prose for differences between views or things; also common in collating versions of texts.
• Related不整合ふせいごうWrittenWritten/formal prose for things not fitting together; also a geology term.
• Related不調和ふちょうわWrittenWritten/formal prose for disharmony, e.g. of colors or atmosphere.
• Related相反そうはんWrittenWritten/formal prose for mutual opposition, as in 「利益相反」.
• Antonym同一どういつNeutralAntonym: completely identical, as in 「同一人物」; the direct opposite of 「不同」.
• Antonym均一きんいつNeutralAntonym: uniform and even throughout, as in 「全品均一」; the opposite of 「不同」.

General talk of a difference calls for 「違い」. 「不同」 itself now survives mostly in fixed expressions like 「順不同」 (no particular order), stressing things being out of order or not uniform. When two accounts or opinions fail to match, say 「食い違い」; for identical, the opposite, use 「同一」. Most other options here are written/formal prose.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 同おなじでないこと。揃そろっていないこと。そのさま。