perverse person; cynic; misanthrope
Refers to someone who is habitually contrary, cynical, or misanthropic; often implies a stubborn, disagreeable personality.
He has become a complete cynic.
That perverse person never listens to anyone.
Compound of 拗ね (sune, 'to be peevish, sulky') + 者 (mono, 'person'). The exact historical derivation is uncertain, but the word has been used to describe a contrary or cynical person.