Meaning of the word "a fair face may hide a foul heart" in English

What does "a fair face may hide a foul heart" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

a fair face may hide a foul heart

US /ə fɛr feɪs meɪ haɪd ə faʊl hɑrt/
UK /ə feə feɪs meɪ haɪd ə faʊl hɑːt/
"a fair face may hide a foul heart" picture

Idiom

a person who appears beautiful or kind on the outside may have a wicked or dishonest character

Example:
He seemed so charming at first, but remember that a fair face may hide a foul heart.
Don't trust her just because she's pretty; a fair face may hide a foul heart.