adjective.
Characteristic of or appropriate to the spoken language or to writing that seeks the effect of speech; informal.
adjective.
Relating to conversation; conversational.
The Century Dictionary and Cyclopedia
Pertaining to conversation; conversational.
Peculiar or appropriate to the language of common or familiar conversation; belonging to ordinary, every-day speech: often especially applied to common words and phrases which are not admissible in elegant or formal speech.
the GNU version of the Collaborative International Dictionary of English
adjective.
Pertaining to, or used in, conversation, esp. common and familiar conversation; conversational; hence, unstudied; informal.
adjective.
Denoting a manner of speaking or writing that is characteristic of familiar conversation; informal.
adjective.
Of or pertaining to a conversation; conversational or chatty.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adjective.
characteristic of informal spoken language or conversation
Word Usage
"But once it was realized that both speech and writing contained both formal and informal varieties, the term colloquial was not so effective, because it lacks an antonym apart from non-colloquial, and the like."