Meaning of “facetious” in the English Dictionary

"facetious" in British English

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facetiousadjective

uk /fəˈsiː.ʃəs/ us /fəˈsiː.ʃəs/ disapproving

not serious about a serious subject, in an attempt to be funny or to appear clever :

facetious remarks
He's just being facetious.
facetiously
adverb uk /fəˈsiː.ʃəs.li/ us /fəˈsiː.ʃəs.li/
facetiousness
noun [ U ] uk /fəˈsiː.ʃəs.nəs/ us /fəˈsiː.ʃəs.nəs/

(Definition of “facetious” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"facetious" in American English

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facetiousadjective

us /fəˈsi·ʃəs/

not seriously meaning what you say, usually in an attempt to be humorous or to trick someone:

I make so much money that we never have to worry – I’m being facetious.
facetiously
adverb us /fəˈsi·ʃəs·li/

"We could spend all our income on health care," she said facetiously.

(Definition of “facetious” from the Cambridge Academic Content Dictionary © Cambridge University Press)