doubtful
/ˈdaʊtfʊl/adjective
1
- feeling uncertain about something拿不准的, 不能肯定的, 疑惑的, 怀疑的：
he looked doubtful, but gave a nod
他看上去有点吃不准, 但还是点了一下头
I was doubtful of my judgement
我对自己的判断有怀疑。
2
- not known with certainty可疑的, 不确定的, 不确知的：
the fire was of doubtful origin.
火源尚未查明。
2.1
- improbable不大可能的, 未必会（发生）的, 未必确实的：
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。
2.2
- not established as genuine or acceptable未定的, 未决的：
of doubtful legality.
合法性值得怀疑的。
派生词