doubtful

doubt|ful /d'aʊtfʊl/
1 [ADJ] usu v-link ADJ, oft it v-link ADJ that/wh
If it is doubtful that something will happen, it seems unlikely to happen or you are uncertain whether it will happen.
For a time it seemed doubtful that he would move at all...
It is doubtful whether Tweed, even with his fluent French, passed for one of the locals...
2 [ADJ] usu v-link ADJ, oft ADJ about n
If you are doubtful about something, you feel unsure or uncertain about it.
I was still very doubtful about the chances for success...
Why did he sound so doubtful?
= dubious
doubtfully [ADV] ADV after v
Keeton shook his head doubtfully.
= dubiously
3 [ADJ] usu ADJ n
If you say that something is of doubtful quality or value, you mean that it is of low quality or value.
...selling something that is overpriced or of doubtful quality...
= dubious
4 [ADJ] oft ADJ for n
If a sports player is doubtful for a match or event, he or she seems unlikely to play, usually because of injury. (JOURNALISM)

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