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foolish

adjective
 
 
/ˈfuː.lɪʃ/

Definition

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.Stupid and sillyOf unsound mind foolishly
 
 
/-li/ adverb
B2 Foolishly, I didn't write the phone number down.Stupid and sillyOf unsound mind
foolishness
 
 
/-nəs/ noun [U]
Stupid and silly behaviour
(Definition of foolish adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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