dubious
adj. 可疑的,靠不住的;有疑虑的;(荣誉、名声等)不好的,不光彩的;质量不佳的
例句
They indulged in some highly dubious business practices to obtain their current position in the market.
他们采取了一些极为可疑的商业手段以取得目前在市场上的地位。
《牛津词典》
The testimony given by him is dubious.
他所作的证据是可疑的。
《新英汉大辞典》
The idea was to stop such accounts being used for dubious purposes.
其想法是防止这些账户被用于可疑的目的。