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doubtful

adjective
     
doubt‧ful
1 probably not true or not likely to happen:
Prospects for a lasting peace remain doubtful.
it is doubtful if/whether
It was doubtful whether the patient would survive the operation.
it is doubtful that
It is doubtful that the missing airmen will ever be found.
2 not sure that something is true or right:
'Everything's going to be all right, you'll see.' Jenny looked doubtful.
doubtful if/whether
I'm still doubtful whether I should accept this job.
doubtful about (doing) something
At first we were doubtful about employing Charlie.
3 unlikely to be successful:
Already the whole scheme was looking increasingly doubtful.
4 probably not good [= dubious]:
Here the tap water is of doubtful quality.
doubtfully adverb

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