UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈdaʊt/US:USA pronunciation: IPA and respellingUSA pronuncation: IPA/daʊt/ ,USA pronunciation: respelling(dout)

WordReference Random House Learner's Dictionary of American English © 2020
doubt /daʊt/USA pronunciation   v. [not: be + ~-ing]
  1. to be uncertain about;
    wonder: [+ object]I doubt his honesty when it comes to his job, don't you? I doubt it.[+ (that) clause]I wouldn't doubt that she'd want to help.[+ whether + clause;  only in positive phrases]I doubt whether she'll change her mind.
  2. to distrust:[+ object]I never doubted you; I was sure you would bring us the money.

  1. a feeling of uncertainty: [uncountable]a great deal of doubt about whether he'll win the election.[countable]You think everything will turn out well, but I have my doubts.
  2. distrust or suspicion:[countable;  usually plural]We have grave doubts about his honesty.
  1. Idiomsbeyond (a or the shadow of ) a doubt, with certainty;
    definitely:guilty beyond a shadow of a doubt.
  2. Idiomsin doubt, in a state of uncertainty:The outcome of the election was in doubt.
  3. Idiomsno doubt: 
    • probably:No doubt you'll be back at school tomorrow.
    • certainly:As you have been told, no doubt, we expect the budget cuts to affect us.
  4. Idiomswithout doubt, unquestionably;
    certainly:She is, without doubt, the finest teacher in the school.

doubt•er, n. [countable]
doubt•ing•ly, adv. 

WordReference Random House Unabridged Dictionary of American English © 2020
doubt  (dout),USA pronunciation v.t. 
  1. to be uncertain about;
    consider questionable or unlikely;
    hesitate to believe.
  2. to distrust.
  3. [Archaic.]to fear;
    be apprehensive about.

  1. to be uncertain about something;
    be undecided in opinion or belief.

  1. a feeling of uncertainty about the truth, reality, or nature of something.
  2. distrust.
  3. a state of affairs such as to occasion uncertainty.
  4. [Obs.]fear;
  5. Idiomsbeyond the shadow of a doubt, with certainty;
    definitely. Also,  beyond a doubt, beyond doubt. 
  6. Idiomsin doubt, in a state of uncertainty or suspense:His appointment to the position is still in doubt.
  7. Idiomsno doubt: 
    • probably.
    • certainly:There is no doubt an element of truth in what you say.
  8. Idiomswithout doubt, unquestionably;
doubta•ble, adj. 
doubta•bly, adv. 
doubter, n. 
doubting•ly, adv. 
doubting•ness, n. 
  • Anglo-French, Old French, derivative of the verb, verbal
  • Latin dubitāre to waver, hesitate, be uncertain (frequentative of Old Latin dubāre), equivalent. to dub- doubt + -it- frequentative suffix + -āre infinitive suffix; (noun, nominal) Middle English doute
  • Anglo-French, Old French douter
  • (verb, verbal) Middle English douten 1175–1225
    • 1, 2.See corresponding entry in Unabridged mistrust, suspect, question.
    • 5.See corresponding entry in Unabridged indecision, irresolution.
    Doubt and doubtful may be followed by a subordinate clause beginning with that, whether, or if: I doubt that (or whether or if ) the story is true. It is doubtful that (or whether or if ) the story is true. There is some doubt that (or whether or if ) the story is true. In negative or interrogative sentences, that almost always introduces the subordinate clause:I do not doubt that the story is true. Is it doubtful that the story is true? Is there any doubt that the story is true?The expressions doubt but and doubt but that occur in all varieties of standard speech and writing:I don't doubt but she is sincere. There is no doubt but that the charges will affect his career.Doubt but what occurs mainly in informal speech and writing:There is no doubt but what the rainy weather will hurt the crops.

Collins Concise English Dictionary © HarperCollins Publishers::
doubt /daʊt/ n
  1. uncertainty about the truth, fact, or existence of something (esp in the phrases in doubt, without doubt, beyond a shadow of doubt, etc)
  2. (often plural) lack of belief in or conviction about something: all his doubts about the project disappeared
  3. an unresolved difficulty, point, etc
  4. obsolete fear
  5. give someone the benefit of the doubtto presume someone suspected of guilt to be innocent; judge leniently
  6. no doubtalmost certainly
  1. (tr; may take a clause as object) to be inclined to disbelieve: I doubt we are late
  2. (transitive) to distrust or be suspicious of: he doubted their motives
  3. (intransitive) to feel uncertainty or be undecided
  4. (transitive) archaic to fear
Etymology: 13th Century: from Old French douter, from Latin dubitāre

ˈdoubtable adj ˈdoubter n ˈdoubtingly adv USAGE
Where a clause follows doubt in a positive sentence, it was formerly considered correct to use whether (I doubt whether he will come ), but now if and that are also acceptable. In negative statements, doubt is followed by that: I do not doubt that he is telling the truth. In such sentences, but (I do not doubt but that he is telling the truth) is redundant

'doubt' also found in these entries (note: many are not synonyms or translations):
Collocations: doubt the [facts, outcome, statement], a [small, fleeting, nagging] doubt, doubt the [existence, validity, wisdom, value, sincerity, truth] of, more...

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