Antonyms of adj colloquial

1 sense of colloquial

Sense 1
colloquial, conversational -- (characteristic of informal spoken language or conversation; "wrote her letters in a colloquial style"; "the broken syntax and casual enunciation of conversational English")

INDIRECT (VIA informal) -> formal -- ((of spoken and written language) adhering to traditional standards of correctness and without casual, contracted, and colloquial forms; "the paper was written in formal English")

Similarity of adj colloquial

1 sense of colloquial

Sense 1
colloquial, conversational -- (characteristic of informal spoken language or conversation; "wrote her letters in a colloquial style"; "the broken syntax and casual enunciation of conversational English")
       => informal (vs. formal) -- (used of spoken and written language)