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1 a foolish action, remark etc is stupid and shows that someone is not thinking sensibly [= silly]:
I've never heard anything so foolish in all my life.
It would be foolish to ignore his advice.
be foolish enough to do something
I was foolish enough to believe him.
2 a foolish person behaves in a silly way or looks silly [= stupid]:
I was young and foolish at the time.
a foolish grin
look/feel foolish
He'd been made to look foolish.
foolishly adverb:
She foolishly agreed to go with them.
foolishness noun [uncountable]

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