Meaning of “foolish” in the English Dictionary

"foolish" in British English

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foolishadjective

uk /ˈfuː.lɪʃ/ us /ˈfuː.lɪʃ/

B2 unwise, stupid, or not showing good judgment:

That was a rather foolish thing to do.
She was afraid that she would look foolish if she refused.
It was foolish of them to pay so much.

More examples

foolishly
adverb uk /ˈfuː.lɪʃ.li/ us /ˈfuː.lɪʃ.li/

B2

Foolishly, I didn't write the phone number down.
foolishness
noun [ U ] uk /ˈfuː.lɪʃ.nəs/ us /ˈfuː.lɪʃ.nəs/

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

"foolish" in American English

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foolishadjective

us /ˈfu·lɪʃ/

stupid or unwise:

She was afraid that she would look foolish if she refused to go along with her friends.
It would be foolish of us to assume that everything will work out fine.
foolishly
adverb us /ˈfu·lɪʃ·li/

I would just like to know that my taxes are not being foolishly spent.
foolishness
noun [ U ] us /ˈfu·lɪʃ·nəs/

My father was not one to tolerate foolishness.

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