せいはんたい 正反対 Common word LinksSentence search for 正反対Sentence search for せいはんたいKanji details for 正, 反 and 対Edit in JMdict Noun which may take the genitive case particle 'no', Na-adjective (keiyodoshi), Noun1. exactly the opposite (of); completely opposite; quite contrary Discussions Log in to talk about this word.