in·for·mal /(ˌ)ɪnˈfɔrməl/
 (a.)非正式的,不拘禮的,通俗的


 informal
 非型式 非正式


 In·form·al a.
 1. Not in the regular, usual, or established form; not according to official, conventional, prescribed, or customary forms or rules; irregular; hence, without ceremony; as, an informal writing, proceeding, or visit.
 2. Deranged in mind; out of one's senses. [Obs.]
    These poor informal women.   --Shak.

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 informal
      adj 1: not formal; "conservative people unaccustomed to informal
             dress"; "an informal free-and-easy manner"; "an
             informal gathering of friends" [ant: formal]
      2: not officially recognized or controlled; "an informal
         agreement"; "a loose organization of the local farmers"
         [syn: loose]
      3: used of spoken and written language [ant: formal]
      4: having or fostering a warm or friendly atmosphere;
         especially through smallness and informality; "had a cozy
         chat"; "a relaxed informal manner"; "an intimate cocktail
         lounge"; "the small room was cozy and intimate" [syn: cozy,
          intimate]