truther
noun [ C ] US uk/ˈtruː.θər/ us/ˈtruː.θɚ/
阴谋论者，自以为掌握真理的人
someone who does not believe the generally accepted explanation for an event or situation and thinks it is the result of a secret plan made by powerful people
He is a truther - one of those who believes that 9/11 was some sort of government operation. 他是个阴谋论者——是那些认为911事件是某种政府操作的人中的一个。
Synonym: conspiracy theorist