形容詞 dubious:

1. fraught with uncertainty or doubt
   同義詞：doubtful
2. open to doubt or suspicion- Karen Horney
   同義詞：doubtful, dubitable, in question
3. not convinced

1. He shares the same rotten tastes with some dubious characters.
   他和一些不三不四的人臭味相投。
2. I remain dubious about her motives.
   我對(duì)她的動(dòng)機(jī)仍存疑念。
3. I feel dubious about his honesty.
   我對(duì)他的誠實(shí)表示懷疑。
4. I feel dubious about what to do next.
   我不知道下一步該怎么辦。

du.bi.ous

adj.（形容詞）
Fraught with uncertainty or doubt; undecided.
不確定的：充滿不定或懷疑的；未決的
Arousing doubt; doubtful:
引起懷疑的；可疑的：
例句：
a dubious distinction.
令人懷疑的區(qū)別

Of questionable character:
有問題的：
例句：
dubious profits.See Synonyms at doubtful
靠不住的利潤參見 doubtful

來源：
From Latin dubius * see dwo-
源自 拉丁語 dubius *參見 dwo-

【引伸】
du.biously
adv.（副詞）
du.biousness
n.（名詞）