(a.) Used in informal conversation (as opposed to formal writing)\, esp. common and familiar conversation; conversational; hence, unstudied; informal; as, colloquial intercourse; colloquial phrases; a colloquial style.

chatty chitchatty common communicative confabulatory conversational cozy everyday familiar informal interlocutory nonstandard patois spoken substandard uneducated unliterary unstudied vernacular vulgar vulgate