foolish Definition in the Cambridge English Dictionary
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Definition of “foolish” - English Dictionary

Definition of "foolish" - American English Dictionary

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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)

Definition of "foolish" - British English Dictionary

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foolishadjective

uk   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 topay so much.
More examples
foolishly
adverb uk   us   /-li/
B2 Foolishly, I didn't write the ​phonenumber down.
foolishness
noun [U] uk   us   /-nəs/
(Definition of foolish from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
Translations of “foolish”
in Arabic أَحْمَق, سَخيف…
in Korean 멍청한…
in Portuguese bobo, tolo, insensato…
in Catalan ximple, estúpid…
in Japanese 愚かな…
in Chinese (Simplified) 愚蠢的,傻的…
in Turkish aptal, akılsız…
in Russian глупый…
in Chinese (Traditional) 愚蠢的,傻的…
in Italian sciocco…
in Polish głupi…
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