逆|ぎゃくgyaku[0]heiban (flat)

1. no-adjective, na-adjectivereverse; opposite
   夫おっとの方ほうが殴なぐったと彼女かのじょは言いっているが、実じつはその逆ぎゃくだった。↗

   She said that her husband hit her, but in fact it was the other way around.
2. na-adjective, nounconverse (of a hypothesis, etc.)
3. noun (prefix), mathinverse (function)

• SynonymあべこべCasualColloquial and faintly humorous, for positions or order swapped around, as in 「靴をあべこべに履く」; 「逆」 is the more general word.
• Synonym反対はんたいNeutralFor opposite directions and sides (「反対側」), but also for objection, as in 「計画に反対する」 — a use 「逆」 does not have.
• Synonym正反対せいはんたいNeutralThe exact, complete opposite, as in 「性格が正反対だ」 — stronger in degree than 「逆」.
• Synonym逆ささかさNeutralFor things turned upside down or back to front, as in 「逆さに吊るす」; mostly physical objects. 「逆」 covers opposite direction or order generally, not just inversion.
• Synonym逆しまさかしまWrittenWritten and literary, for inversion or for what defies reason; in everyday speech 「逆さま」 is the normal choice.
• Synonym裏腹うらはらNeutralFor one thing being the exact opposite of another, as in 「言葉と裏腹に」 or 「期待とは裏腹な結果」; typically words and deeds, or expectations versus results.
• Synonym逆さまさかさまNeutralFor things upside down or back to front, as in 「絵が逆さまだ」; mostly the orientation of concrete objects.
• SynonymリバースCasualColloquial loanword for reversing, rewinding or backing up, as in 「リバース再生」 (also 「逆再生」); its slang sense of vomiting cannot be replaced by 「逆」.
• Related対極たいきょくWrittenWritten style for the opposite extreme, as in 「対極にある考え」, stressing two poles set against each other.
• Related逆にぎゃくにNeutralAdverb meaning conversely, as in 「逆に言えば」, used to introduce something contrary to what was expected.
• Related相反そうはんWrittenWritten word for two things being mutually opposed or contradictory, as in 「利益相反」; mostly abstract relations.
• Antonym順じゅんNeutralAntonym: order and things going smoothly, as in 「順を追って」 — the normal sequence that 「逆」 reverses.
• Antonym正せいWrittenAntonym in technical and written usage: the normal or forward side, as in 「正逆」「正転」, opposed to 「逆」 as the reversed direction.

Use 「逆」 for opposite direction or order. For concrete things turned upside down or back to front, 「逆さま」 or colloquial 「あべこべ」 fits; for objection use 「反対」, for the exact opposite 「正反対」, and for results contrary to expectations 「裏腹」. In formal prose, 「対極」 and 「相反」 handle opposite extremes and abstract mutual opposition.

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

1. （ギャク） 物事ものごとの順序じゅんじょ、方向ほうこう、位置いち関係かんけいなどが反対はんたいであること。
2. （ギャク） 命題めいだい「p ならばq である」に対たいして、その前件ぜんけんと後件こうけんを入れ換いれかえた命題めいだいをいう。もとの命題めいだいは真しんでも、逆ぎゃくは必かならずしも真しんでない。
3. （ギャク）（古いにしえ） 道理どうりに背そむいていること。また、そのさま。
4. （ギャク）柔道じゅうどうで関節技かんせつわざ。
5. （さか 物事ものごとの順序じゅんじょ、方向ほうこう、位置いち関係かんけいなどが反対はんたいであること。