be no fool

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be no fool

To be worldly and difficult to trick or deceive. Your teacher is no fool—she'll never believe that your homework blew away on your walk home from school.
See also: fool, no

be no (or nobody's) fool

be a shrewd or prudent person.
See also: fool, no

be ˌno/ˌnobody’s ˈfool

be a clever person who cannot easily be tricked or cheated by anyone: You won’t be able to cheat her — she’s nobody’s fool. ♢ Don’t underestimate him. He’s no fool.
See also: fool, no
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