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nobody's fool
nobody's fool
Fig. a sensible and wise person who is not easily deceived. Mary is nobody's fool. She watches out for people who might try to cheat her. Anne may seem as though she's not very bright, but she's nobody's fool.
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]