Definition of facetiously adverb from the Oxford Advanced Learner's Dictionary

 

facetiously

 adverb
adverb
BrE BrE//fəˈsiːʃəsli//
 
; NAmE NAmE//fəˈsiːʃəsli//
 
 
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in a way that tries 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 flippantly