informal

Etymology

From in- + formal.

adj

  1. Not formal or ceremonious.
    an informal get-together
    Students and faculty members lunch at the cafeteria and naturally communicate freely with one another in a relaxed and informal setting. 2019, Li Huang, James Lambert, “Another Arrow for the Quiver: A New Methodology for Multilingual Researchers”, in Journal of Multilingual and Multicultural Development, →DOI, page 4
  2. Not in accord with the usual regulations.
    an informal agreement
  3. Suited for everyday use.
    informal clothes
  4. (of language) Reflecting everyday, non-ceremonious usage.
  5. (horticulture) Not organized; not structured or planned.

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