物もの知しり顔がお

noun

knowing look; know-it-all expression

Describes a facial expression or attitude that suggests one knows everything, often with a slightly negative or ironic nuance.

• 彼かれは物もの知しり顔がおで説せつ明めいを始はじめた。

  He started explaining with a knowing look.

• 物もの知しり顔がおでうなずくだけでは、本ほん当とうに理り解かいしているかどうかわからない。

  Just nodding with a know-it-all expression doesn't tell me whether you really understand.