doubt

doubtverb

American /daʊt/ British /daʊt/ The b is silent: doubt rhymes with out.
third-person singular doubts past tense doubted past participle doubted present participle doubting
  1. think not truethink that something is probably not true or will probably not happen

    With whether or if, the speaker is simply not sure: I doubt whether it matters. With that, or with no linking word, the speaker thinks the answer is probably no.

    transitive [T] verb + that-clause [V + that] verb + object [V + obj] verb + wh-clause [V + wh]

    Collocations

    adverb + verb seriously doubt, strongly doubt, rather doubt
    phrase I doubt it, I doubt very much that

    Compare suspect (think something probably is true)

  2. not trustnot believe that someone is honest or that something is true or good enough

    transitive [T] verb + object [V + obj] verb + that-clause [V + that]

    Collocations

    verb + noun doubt someone's word, doubt someone's ability, doubt yourself
    adverb + verb never doubt

    Synonyms question

    Antonyms trust; believe

Word family

  • doubt
  • doubtful
  • doubtless
  • undoubtedly

Usage

I don't doubt that and there's no doubt that mean the speaker is sure: I don't doubt that you tried means I am sure you tried. In a negative sentence or a question, doubt is usually followed by that, not whether.

Common mistakes

I doubt that he took the money, because he was the only one in the room. I suspect that he took the money, because he was the only one in the room.
Doubt means you think it is probably not true; suspect means you think it probably is.
I doubt about his story. I doubt his story.
Doubt takes an object directly, with no about.

For translators

Meaning across languages Some languages use one word for both thinking that something is probably true and thinking it is probably not. English separates them: suspect for the first, doubt for the second.
Pronunciation trap "doubt": the b is never said. The same is true of doubtful and debt.