butter won't melt in someone's mouth

A form of butter wouldn't melt in someone's mouth — 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).

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Meanings

phrase
  1. alternativeAlternative form of butter wouldn't melt in someone's mouth.
Cite this entry
APA

butter won't melt in someone's mouth. (n.d.). In WatkinsX Dictionary. Retrieved November 5, 2026, from https://dictionary.watkinsx.com/word/butter%20won't%20melt%20in%20someone's%20mouth

MLA

“butter won't melt in someone's mouth.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/butter%20won't%20melt%20in%20someone's%20mouth. Accessed November 5, 2026.

Chicago

WatkinsX Dictionary, s.v. “butter won't melt in someone's mouth,” accessed November 5, 2026, https://dictionary.watkinsx.com/word/butter%20won't%20melt%20in%20someone's%20mouth.

Source: butter won't melt in someone's mouth on Wiktionary, CC BY-SA 4.0.