他的笑容显得紧张而不自然。

His smile seemed strained and ___artificial.

她以一种做作的方式赞扬她的同事，让每个人都不舒服。

She praised her colleague in an ___artificial way, making everyone uncomfortable.

尽管她表现出做作的关心，但很明显她并没有真正的兴趣。

Despite her ___artificial display of concern, it was clear she had no genuine interest.