adj. 25B6; adjective FLIPPANT, flip, glib, frivolous, tongue-in-cheek, joking, jokey, jocular, playful, sportive, teasing, mischievous; witty, amusing, funny, droll, comic, comical, light-hearted; formal jocose.
serious.
FACETIOUS
Meaning of FACETIOUS in English
Concise Oxford thesaurus English vocabulary. Краткий оксфордский словарь английского языка тезаурус. 2012