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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
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Nearby words for nobody's fool
nobody knows the trouble i've seen
nobody likes a smart-ass