Meaning of the word "a honey tongue, a heart of gall" in English

What does "a honey tongue, a heart of gall" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

a honey tongue, a heart of gall

US /ə ˈhʌn.i tʌŋ ə hɑːrt əv ɡɔːl/
UK /ə ˈhʌn.i tʌŋ ə hɑːt əv ɡɔːl/
"a honey tongue, a heart of gall" picture

Idiom

describing someone who speaks very sweetly or kindly but has malicious or bitter intentions

Example:
Be careful with his flattery; he has a honey tongue, a heart of gall.
The politician's speech was charming, but the public sensed a honey tongue, a heart of gall.