informal

If something’s informal, it’s casual and relaxed and doesn’t follow any particular rules or conventions, whether that's a style of writing, or the dress code for your dinner party.

If you have informal plans to see your friend, that means you’ll get together but you’re not sure when — you’ll figure it out later. Informal also means “casual,” like wearing jeans and a t-shirt. Informal writing or speech is the linguistic equivalent of wearing jeans and a t-shirt, with a relaxed tone and simple words. In an informal football club, you don't pay dues to anyone, you just show up at the park and play with whoever is there.

Definitions of informal
  1. adjective
    not formal
    “conservative people unaccustomed to informal dress”
    “an informal free-and-easy manner”
    “an informal gathering of friends”
    Synonyms:
    casual, daily, everyday
    appropriate for ordinary or routine occasions
    casual, free-and-easy
    natural and unstudied
    folksy
    very informal and familiar
    unceremonial, unceremonious
    without ceremony or formality
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    Antonyms:
    formal
    being in accord with established forms and conventions and requirements (as e.g. of formal dress)
    conventional
    following accepted customs and proprieties
    ceremonial
    marked by pomp or ceremony or formality
    ceremonious, conventional
    rigidly formal or bound by convention
    dress, full-dress
    (of an occasion) requiring formal clothes
    form-only
    being a matter of form only; lacking substance
    dress, full-dress
    suitable for formal occasions
    nominal, titular
    existing in name only
    positive, prescribed
    formally laid down or imposed
    perfunctory, pro forma
    as a formality only
    black-tie, semi-formal, semiformal
    moderately formal; requiring a dinner jacket
    buckram, starchy, stiff
    rigidly formal
    white-tie
    requiring white ties and tailcoats for men
    formal
    (of spoken and written language) adhering to traditional standards of correctness and without casual, contracted, and colloquial forms
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  2. adjective
    having or fostering a warm or friendly and informal atmosphere
    “a relaxed informal manner”
    synonyms: cozy, intimate
    friendly
    characteristic of or befitting a friend
  3. adjective
    not officially recognized or controlled
    “an informal agreement”
    synonyms: loose
    unofficial
    not having official authority or sanction
  4. adjective
    used of spoken and written language
    Synonyms:
    colloquial, conversational
    characteristic of informal spoken language or conversation
    common, vernacular, vulgar
    being or characteristic of or appropriate to everyday language
    epistolary, epistolatory
    written in the form of or carried on by letters or correspondence
    slangy
    constituting or expressed in slang or given to the use of slang
    subliterary
    not written as or intended to be literature
    nonliterary, unliterary
    marked by lack of affectation or pedantry
    unrhetorical
    not rhetorical
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    Antonyms:
    formal
    (of spoken and written language) adhering to traditional standards of correctness and without casual, contracted, and colloquial forms
    formal
    being in accord with established forms and conventions and requirements (as e.g. of formal dress)
    literary
    appropriate to literature rather than everyday speech or writing
    rhetorical
    given to rhetoric, emphasizing style at the expense of thought
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