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 colloquial talents were, indeed, of the highest order.
Macaulay.