i-adjective
unnatural; affected; forced; studied
Describes behavior, speech, or expressions that feel deliberately exaggerated or insincere, as if the person is putting on an act.
彼の笑顔はわざとらしくて、全然嬉しそうじゃなかった。
His smile was forced and didn't look happy at all.
He gave an affected cough to try to get attention.