colloquial

colloquial
    adj 1: characteristic of informal spoken language or
           conversation; "wrote her letters in a colloquial style";
           "the broken syntax and casual enunciation of
           conversational English" [syn: {colloquial},
           {conversational}]
    

Colloquial \Col*lo"qui*al\, a. [See {Colloqui}.]
   Pertaining to, or used in, conversation, esp. common and
   familiar conversation; conversational; hence, unstudied;
   informal; as, colloquial intercourse; colloquial phrases; a
   colloquial style. -- {Col*lo"qui*al*ly}, adv.
   [1913 Webster]

         His [Johnson's] colloquial talents were, indeed, of the
         highest order.                           --Macaulay.
   [1913 Webster]
    

21 Moby Thesaurus words for "colloquial":
      chatty, chitchatty, common, communicative, confabulatory,
      conversational, cozy, everyday, familiar, informal, interlocutory,
      nonstandard, patois, spoken, substandard, uneducated, unliterary,
      unstudied, vernacular, vulgar, vulgate