a. 会话的, 口语的, 口语体的

[ adj ]
characteristic of informal spoken language or conversation
<adj.all>
wrote her letters in a colloquial stylethe broken syntax and casual enunciation of conversational English

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.

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