Did you know?

Click any word in a definition or example to find the entry for that word

folly - definition and synonyms


What are red words?

90% of the time, speakers of English use just 7,500 words in speech and writing. These words appear in red, and are graded with stars. One-star words are frequent, two-star words are more frequent, and three-star words are the most frequent.



The thesaurus of synonyms and related words is fully integrated into the dictionary. Click on the thesaurus category heading under the button in an entry to see the synonyms and related words for that meaning.

noun folly pronunciation in American English /ˈfɑli/
Word Forms
  1. 1
    [countable/uncountable] formal a way of thinking or behaving that is stupid and careless, and likely to have bad results

    The judge described the incident as an act of folly.

    it is folly to do something:

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

    the folly of (doing) something:

    She soon realized the folly of her actions.

    I pointed out the folly of overspending on that scale.


sea lion

in an online conversation, repeatedly asking a person questions which suggest that you are interested in what they are talking about, but are actually intended to annoy them

BuzzWord Article

Open Dictionary


an electric skateboard

add a word


A must for anyone with an interest in the changing face of language. The Macmillan Dictionary blog explores English as it is spoken around the world today.

global English and language change from our blog
Macmillan learn live love play