Unnatural or affected; seeming contrived or exaggerated (used for behaviour, speech, acting that appears forced).
彼女の笑い方が少しわざとらしい。
Her way of laughing is a bit affected.
その俳優の演技はわざとらしくて感情移入しにくい。
That actor's performance is so affected that it's hard to empathize.
わざとらしい言い訳は誰も信じないよ。
No one will believe an obviously contrived excuse.
彼のリアクションはわざとらしくて、場の雰囲気が壊れた。
His reaction was so affected that it ruined the mood.