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English definition of “folly”

folly

noun uk   /ˈfɒl.i/ us    /ˈfɑː.li/

folly noun (STUPIDITY)

[C or U] formal the fact of being stupid, or a stupid action, idea, etc.: She said that the idea was folly. [+ to infinitive] It would be folly for the country to become involved in the war.

folly noun (BUILDING)

[C] (especially in Britain) a building in the form of a small castle, temple, etc., that has been built as a decoration in a large garden or park: a Gothic garden folly
(Definition of folly from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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