feeling uncertain about something
拿不准的,不能肯定的,疑惑的,怀疑的
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he looked doubtful, but gave a nod 他看上去有点吃不准,但还是点了一下头
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I was doubtful of my judgement 我对自己的判断有怀疑。
not known with certainty
可疑的,不确定的,不确知的
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the fire was of doubtful origin .火源尚未查明。
improbable
不大可能的,未必会(发生)的,未必确实的
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[with clause]
it is doubtful whether these schemes have any lasting effect .这些计划未必会产生持续的效果。
not established as genuine or acceptable
未定的,未决的
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of doubtful legality. 合法性值得怀疑的。