正せい反はん対たい

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Meanings

noun which may take the genitive case particle 'no', na-adjective, noun

exactly opposite; completely contrary

Emphasizes a total, diametrical opposition. Often used in the pattern ～と正反対だ or as a な-adjective modifying a noun.

〈人ひと〉と正せい反はん対たいの性せい格かくをしているto have a personality that is the exact opposite of someone else's
彼かれは兄あにと正せい反はん対たいの性せい格かくをしている。
He has a personality that's exactly opposite his older brother's.
〈事こと〉と正せい反はん対たいの結けっ果かになるto end up with a result that is exactly the opposite of expected
予よ想そうと正せい反はん対たいの結けっ果かになった。
The result turned out to be exactly the opposite of what was predicted.
正せい反はん対たいの方ほう向こうに進すすむto go in exactly the opposite direction
二人ふたりは正せい反はん対たいの方ほう向こうに歩あるいて行いった。
The two of them walked off in exactly opposite directions.

反はん対たいN4
反対 means 'opposite' or 'opposition' in a general sense, while 正反対 emphasizes that something is exactly and completely opposite, with no middle ground.
逆ぎゃくN3
逆 is a neutral, everyday word for 'reverse' or 'opposite' (e.g. 逆方向), while 正反対 stresses a total, diametrical contrast, often between two things being compared.
あべこべN1
あべこべ is a casual word for things being reversed or mixed up (like shoes on the wrong feet), while 正反対 is more formal and describes two things being exact opposites in nature or character.
対たい極きょく
対極 is a more formal, abstract term for 'polar opposite' often used about ideas or positions, whereas 正反対 is the everyday word for describing two things or people being exactly opposite.

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対たい照しょう的てき
対照的 describes things that differ strikingly when compared, while 正反対 means they are exact opposites in every respect.
１８０ひゃくはちじゅう度ど
正反対 means 'exact opposite' in a neutral, descriptive way, while １８０度 frames the change as a sudden, dramatic turnaround.

Compound of 正 (せい, 'correct' or 'exact') and 反対 (はんたい, 'opposite'), literally 'exact opposite'.