impostor
noun [ C ] (also imposter) uk/ɪmˈpɒs.tər/ us/ɪmˈpɑː.stɚ/
冒名顶替者
a person who pretends to be someone else in order to deceive others
He felt like an impostor among all those intelligent people, as if he had no right to be there. 他感觉自己在所有那些聪明人中间像个冒牌货——好像自己无权在那儿。