na-adjective, noun which may take the genitive case particle 'no', noun
triumphant air; smugness
Describes a facial expression or attitude of obvious self-satisfaction, often with a nuance of smugness. Commonly used in the phrase 得意満面の笑み (a smug/triumphant smile).
彼は得意満面の笑みを浮かべた。
He wore a smug smile.
試験に合格して、得意満面で帰ってきた。
Having passed the exam, he came home with a triumphant air.