Definition of facetious adjective from the Oxford Advanced Learner's Dictionary



BrE BrE//fəˈsiːʃəs//
; NAmE NAmE//fəˈsiːʃəs//
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trying to appear amusing and intelligent at a time when other people do not think it is appropriate, and when it would be better to be serious synonym flippant a facetious comment/remark Stop being facetious; this is serious. Word Originlate 16th cent. (in the general sense ‘witty, amusing’): from French facétieux, from facétie, from Latin facetia ‘jest’, from facetus ‘witty’.
See the Oxford Advanced American Dictionary entry: facetious