noun, noun or participle which takes 'suru', noun which may take the genitive case particle 'no'
self-congratulation; self-satisfaction
Refers to being pleased with oneself or one's own actions, often with a nuance of smugness or self-admiration. Can be used as a noun, with する, or as a の-adjective.
彼は自分の成功に自己満悦している。
He is self-congratulatory about his own success.
自
He wore a self-satisfied smile.