feign
verb [ T ] uk/feɪn/ us/feɪn/
假装（某种感情），装作
to pretend to have a particular feeling, problem, etc.
You know how everyone feigns surprise when you tell them how old you are. 你知道当你告诉别人你的年龄时，他们如何故作惊讶。
The prosecution claimed that the defendant had feigned the injury. 原告代理律师称被告的伤是伪装的。
She responded to his remarks with feigned amusement. 她对他的话假装感兴趣。