I. kəˈlōkwēəl adjective
Etymology: colloquy + -al
1. : of or relating to conversation : expressed in conversation : conversational
2. : used in or characteristic of conversation, especially familiar and informal conversation
colloquial English
a letter written in colloquial style
the great majority [of the common words of English are] at once literary and colloquial — Oxford English Dict.
: using or characterized by conversational style
a colloquial poet
II. noun
( -s )
: colloquial style or diction : a colloquial language or dialect
literary Chinese and the various colloquials
III. adjective
: unacceptably informal
considered his writing careless and colloquial