godan verb (-mu), intransitive verb
put on airs; act important; look smug
Describes someone behaving in a self-important, smug, or affectedly refined manner. Often used critically.
彼は会議で澄まし込んで、何も発言しなかった。
He sat there looking smug at the meeting and didn't say anything.
あの人
That person always puts on airs and is hard to approach.