Meaning of “folly” in the English Dictionary

"folly" in British English

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follynoun

uk /ˈfɒl.i/ us /ˈfɑː.li/

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

"folly" in American English

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follynoun [ C/U ]

us /ˈfɑl·i/

the condition of being foolish, or a foolish action or belief:

[ + to infinitive ] It would be folly to attempt a trip in this snowstorm.

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