part of speech: verb

inflections: doubts, doubting, doubted

definition 1: to not know for sure; be uncertain about the truth of.

  • I doubt that I did well on that test.
  • She’s beginning to doubt that a stork brought her baby brother.

synonyms: question

antonyms: accept, believe, expect, trust

definition 2: to lack trust in.

  • I’ve started to doubt her honesty.

synonyms: distrust, mistrust

antonyms: believe, trust


part of speech: noun

definition 1: a feeling of not being certain or sure.

  • He was filled with doubt about his ability to perform in front of an audience.

antonyms: belief, certainty, confidence, faith

definition 2: a feeling of being suspicious.

  • His grand promises filled her with doubt.

synonyms: distrust, misgiving, mistrust, qualm, reservation

antonyms: belief, confidence, faith, trust

definition 3: a condition of being unsure or uncertain.

  • The future of the old drugstore is in doubt because few people shop there anymore.

antonyms: certainty

phrase: beyond the shadow of a doubt

phrase: no doubt

derivations: doubtable (adj.), doubtably (adv.), doubtingly (adv.), doubter (n.)