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Definition folly in British English

folly noun

noun
/ˈfɒli/
1

a way of thinking or behaving that is stupid and careless, and likely to have bad results

Example

The judge described the incident as an act of folly.

Example

It is absolute folly to go mountain climbing without the proper equipment.

Example

She soon realized the folly of her actions.

Example

I pointed out the folly of overspending on that scale.

Synonyms and related words
2

a building that has no practical use and is built as a decoration

Synonyms and related words
2.1

a building or project that costs a lot of money and is not useful

Synonyms and related words
Definition folly in British English