Did you know?

Click any word in a definition or example to find the entry for that word

doubt - definition and synonyms


What are red words?

90% of the time, speakers of English use just 7,500 words in speech and writing. These words appear in red, and are graded with stars. One-star words are frequent, two-star words are more frequent, and three-star words are the most frequent.



The thesaurus of synonyms and related words is fully integrated into the dictionary. Click on the thesaurus category heading under the button in an entry to see the synonyms and related words for that meaning.

noun [countable/uncountable] doubt pronunciation in British English /daʊt/
Word Forms
  1. a feeling of not being certain about something
    doubt about/as to:

    There seems to be some doubt as to whether this is legal.

    have no/little doubt that:

    I have no doubt that he will succeed.

    there is little/no doubt that:

    There’s little doubt that the measures will be extremely unpopular.

    raise doubts (=make you have doubts):

    The accident raised doubts about (=makes people have doubts about) the safety of the aircraft.

    nagging/lingering doubts:

    Nagging doubts about her story do remain.

    grave/serious doubts:

    I have serious doubts about whether this system will work.



to fall over forwards so that your face hits the ground or another surface

BuzzWord Article

Open Dictionary


the activity of exploring abandoned buildings and other manmade structures

add a word


A must for anyone with an interest in the changing face of language. The Macmillan Dictionary blog explores English as it is spoken around the world today.

global English and language change from our blog
Macmillan learn live love play