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nobody's fool

A person who cannot be duped or taken advantage of, as in You can't put anything over on Ryan—he's nobody's fool. [Early 1900s]

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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.

Related Words for nobody's fool

adept, intelligent, able, smart, wise, shrewd, discriminating, sensitive, quick, sharp, astute, acute, brilliant, slick, fast, nimble, bright, subtle, adroit, proficient