1 adj If it is doubtfulthat something will happen, it seems unlikely to happen or you are uncertain whether it will happen.
usu v-link ADJ, oft it v-link ADJ that/wh
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 If you are doubtfulabout something, you feel unsure or uncertain about it.
usu v-link ADJ, oft ADJ about n
I was still very doubtful about the chances for success..., Why did he sound so doubtful?
doubtfully adv ADV after v
Keeton shook his head doubtfully.
3 adj If you say that something is ofdoubtful quality or value, you mean that it is of low quality or value.
usu ADJ n (disapproval)
...selling something that is overpriced or of doubtful quality...
4 adj If a sports player is doubtfulfor a match or event, he or she seems unlikely to play, usually because of injury. (JOURNALISM) oft ADJ for n
Translation English - Cobuild Collins Dictionary
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"Collins Cobuild English Dictionary for Advanced Learners 4th edition published in 2003 © HarperCollins Publishers 1987, 1995, 2001, 2003 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"