正反対|せいはんたいseihantai

1. no-adjective, na-adjectiveexactly the opposite (of); completely opposite; quite contrary
   死しは生なまの正反対せいはんたいである。↗

   Death is the antithesis of life.

• SynonymあべこべCasualColloquial. Says something is turned around or backwards, focusing on front/back or left/right getting mixed up, as in 「靴をあべこべに履く」.
• Synonym反対はんたいNeutralNeutral and very widely used for opposition or being opposite, without stressing degree; 「正反対」 emphasizes being completely, thoroughly opposite.
• Synonym逆ぎゃくNeutralNeutral. Means the reverse or inverse, focusing on direction or order being flipped, as in 「逆に言えば」.
• Synonym対極たいきょくWrittenWritten/formal prose. Points to the opposite pole, focusing on being directly across from something, as in 「対極にある」.
• Related対照的たいしょうてきNeutralNeutral. Describes a striking contrast, focusing on two things differing sharply, as in 「対照的な性格」.
• Related両極りょうきょくWrittenWritten/formal prose. Refers to the two extremes, focusing on things sitting at opposite ends, as in 「意見が両極に分かれる」.
• Antonym同一どういつWrittenWritten/formal prose. Means identical or one and the same — the antonym of 「正反対」, which stresses being completely opposite.
• Antonym一致いっちNeutralNeutral. Means agreement or matching — the antonym of 「正反対」, which stresses being exactly the opposite.

Use 「正反対」 for something completely, thoroughly opposite, as in 「性格が正反対」 or 「正反対の意見」. For general opposition say 「反対」 or 「逆」, for things turned around 「あべこべ」, for sharp contrast 「対照的」, for the opposite pole 「対極」; antonyms are 「一致」 and 「同一」.

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

1. 全まったく反対はんたいであること。全まったく逆ぎゃくであること。真逆まぎゃくであること。