Longman Dictionary of Contemporary English homepage

Date: 1200-1300
Language: French
Origin: douter, from Latin dubitare

doubt

2 verb
     
doubt2 S2 [transitive not in progressive]
1 to think that something may not be true or that it is unlikely:
Kim never doubted his story.
doubt (that)
I doubt we'll ever see him again.
doubt if/whether
You can complain, but I doubt if it'll make any difference.
'Do you think there'll be any tickets left?' ' I doubt it (=I don't think so).'
2 to not trust or have confidence in someone:
I never doubted myself. I always knew I could play tennis at this level.
She loved him, and had never doubted him.
I have no reason to doubt his word (=think that he is lying).
—doubter noun [countable]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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