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.
Farlex Dictionary of Idioms. © 2022 Farlex, Inc, all rights reserved.
be no (or nobody's) fool
be a shrewd or prudent person.Farlex Partner Idioms Dictionary © Farlex 2017
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.Farlex Partner Idioms Dictionary © Farlex 2017