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There seems to be some doubt as to whether this is legal.
I have no doubt that he will succeed.
There's little doubt that the measures will be extremely unpopular.
The accident raised doubts about (=makes people have doubts about) the safety of the aircraft.
Nagging doubts about her story do remain.
I have serious doubts about whether this system will work.
This is the British English definition of doubt. View American English definition of doubt.
a substance that scientists think exists out in space, but for which they have no direct proof