noun, noun which may take the genitive case particle 'no'
self-satisfied look; triumphant expression
Describes a facial expression of smugness or self-satisfaction, often after achieving something or knowing something others don't.
彼はしたり顔でテストの結果を見せた。
He showed his test results with a self-satisfied look.
したり顔で秘密を話す。
To tell a secret with a triumphant expression.