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Adjective: informal  in'for-mul
  1. Not formal
  2. Used of spoken and written language
  3. Not officially recognized or controlled
    "an informal agreement";
    - loose
  4. Having or fostering a warm or friendly and informal atmosphere
    "a relaxed informal manner";
    - cozy [N. Amer], intimate, cosy [Brit, Cdn]

See also: casual, colloquial, common, conversational, daily, epistolary, epistolatory, everyday, folksy, formality, formalness, free-and-easy, friendly, nonliterary, slangy, subliterary, unceremonial, unceremonious, unliterary, unofficial, unrhetorical, vernacular, vulgar

Antonym: formal

Encyclopedia: Informal