Meaning of the word "be no fool" in English

What does "be no fool" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

be no fool

US /bi noʊ fuːl/
UK /bi nəʊ fuːl/
"be no fool" picture

Idiom

to be intelligent and not easily deceived

Example:
You can try to trick him, but he's no fool.
She may seem quiet, but she's no fool when it comes to business.