You can describe someone as a poseur when you think that they behave in an insincere or exaggerated way because they want to make a particular impression on other people.
例句
I am sometimes accused of being an inveterate poseur.有時有人說我慣于裝模作樣。
英漢詞典釋義
n.
裝腔作勢的人
He had been railed against by them as a prig and a poseur.他們責罵他是一個沾沾自喜、裝腔作勢的人。
英英詞典釋義
Noun
1. a person who habitually pretends to be something he is not