1. UNCERTAIN FEELING[countable, uncountable]NOT SURE a feeling of being not sure whether something is true or right. No doubt · Be in doubt · Open to doubt · Self-doubt

if something is in doubt, it may not happen, continue, exist, or be true. The future of the peace talks is in doubt.

used when you are saying that you think something is probably true. No doubt you'll have your own ideas. She was a top student, no doubt about it.

2 NOT SUREnot sure that something is true or right 'Everything's going to be all right, you'll see.' Jenny looked doubtful.

something that is open to doubt has not been proved to be definitely true or real The authenticity of the relics is open to doubt.

to accept what someone tells you, even though you think they may be wrong or lying but you cannot be sure

a feeling of not being certain about something, especially about how good or true it is. have doubts about I'm having doubts about his ability to do the job.

used when advising someone what to do if they are uncertain about something. If in doubt, consult your doctor.

noun [uncountable] the feeling that you and your abilities are not good enough a moment of self-doubt

if something is beyond doubt, it is completely certain. The prosecution must prove beyond reasonable doubt that the accused is guilty of the crime.