Idiom
butter wouldn't melt in someone's mouth
Meaning
The identified person appears to be benign, mild-mannered, or calm (but with an integral suggestion that, to the contrary, they really are untrustworthy, disagreeable, or mean-spirited).
Meaning adapted from Wiktionary, available under CC BY-SA 4.0.
Examples
“He acts so sweet, but butter wouldn't melt in his mouth.”
“She looks innocent enough, but butter wouldn't melt in her mouth when she is trying to get her way.”
“Although he presented himself as a humble servant of the public, those who knew him best suspected that butter wouldn't melt in his mouth.”
Examples
simple
“He acts so sweet, but butter wouldn't melt in his mouth.”
contextual
“She looks innocent enough, but butter wouldn't melt in her mouth when she is trying to get her way.”
complex
“Although he presented himself as a humble servant of the public, those who knew him best suspected that butter wouldn't melt in his mouth.”
Key words
Related idioms
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