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.
His opinion is exactly the opposite of mine.
兄は私と正反対の性格をしている。
My older brother has a personality completely opposite to mine.
He has a personality that's exactly opposite his older brother's.
The result turned out to be exactly the opposite of what was predicted.
The two of them walked off in exactly opposite directions.