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thought not to be completely true or not able to be trusted
半信半疑的,可疑的;不確定的;不可信的
These claims are dubious and not scientifically proven.
這些說法未經(jīng)科學證實,有些可疑。
She knew he really wanted to help her; however, she was dubious about his ability to help.
她知道他是真心想幫她,但對他有沒有那種能力卻半信半疑。