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facetious

adjective
 
 
/fəˈsiː.ʃəs/ disapproving

Definition

not serious about a serious subject, in an attempt to be funny or to appear clever: facetious remarks He's just being facetious.Humour and humorous facetiously
 
 
/-li/ adverb
facetiousness
 
 
/-nəs/ noun [U]
(Definition of facetious adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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