doubt·er
noun/ˈdaʊtə(r)/
/ˈdaʊtər/
- a person who feels uncertain about something or does not believe that something is true or will happen
怀疑者：对某事感到不确定或不相信某事是真实的或将要发生的人 - He was determined to prove the doubters wrong.
他决心证明怀疑者是错误的。
- He was determined to prove the doubters wrong.