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English definition of “facetious”

facetious

adjective  /fəˈsi·ʃəs/ us  
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  /fəˈsi·ʃəs·li/ us  
"We could spend all our income on health care," she said facetiously.
(Definition of facetious from the Cambridge Academic Content Dictionary © Cambridge University Press)
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