butter wouldn't melt in someone's mouth

Phrase

 * 1)  The identified person appears to be benign, mild-mannered, or calm (but with an integral suggestion that, to the contrary, he or she really is untrustworthy, disagreeable, or mean-spirited).
 * 2)  The identified person is prim and proper, standoffish, cool, or dispassionate.
 * 1)  The identified person is prim and proper, standoffish, cool, or dispassionate.
 * 1)  The identified person is prim and proper, standoffish, cool, or dispassionate.
 * 1)  The identified person is prim and proper, standoffish, cool, or dispassionate.
 * 1)  The identified person is prim and proper, standoffish, cool, or dispassionate.
 * 1)  The identified person is prim and proper, standoffish, cool, or dispassionate.
 * 1)  The identified person is prim and proper, standoffish, cool, or dispassionate.
 * 1)  The identified person is prim and proper, standoffish, cool, or dispassionate.
 * 1)  The identified person is prim and proper, standoffish, cool, or dispassionate.

Translations

 * Dutch: van de prins geen kwaad weten
 * French: on lui donnerait le bon Dieu sans confession
 * Spanish: parecer una mosquita muerta
 * Swedish: len i munnen