This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

adj. Characteristic of or appropriate to the spoken language or to writing that seeks the effect of speech; informal.

adj. Relating to conversation; conversational.

adj. Denoting a manner of speaking or writing that is characteristic of familiar conversation; informal.

adj. Of or pertaining to a conversation; conversational or chatty.

adj. Pertaining to, or used in, conversation, esp. common and familiar conversation; conversational; hence, unstudied; informal.

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.

adj. characteristic of informal spoken language or conversation

"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."

informal   

literary    pedantic    formal   

slang    colloquy    colloquium   

colloquiality    colloquialness    colloquially    colloquialism   

conversational    informal    conversationalism    informality    familiarism   

idiomatic    racy    conversational    stilted    poetical    archaic    everyday    grammatical    terse    figurative