Synonyms of informal in English:

informal

adjective

  • 1 an informal chat
    unofficial, casual, relaxed, easygoing, unceremonious; open, friendly, intimate; simple, unpretentious, easy
    informal unstuffy, laid-back, chummy
    [Antonyms] official formal
  • 2 informal language
    colloquial, vernacular, idiomatic, demotic, popular; familiar, everyday, unofficial; simple, natural, unpretentious
    informal slangy, chatty, folksy
    [Antonyms] literary formal
  • 3 informal clothes
    casual, relaxed, comfortable, everyday, sloppy, leisure
    informal comfy, cazh
    [Antonyms] formal
  • Definition of informal in:

    Get more from Oxford Dictionaries

    Subscribe to remove adverts and access premium resources

    Word of the day setose
    Pronunciation: ˈsiːtəʊs
    adjective
    bearing bristles or setae; bristly