informal Appear gentle or innocent while typically being the opposite.
- At home, he's placid and gentle and happy and looks as if butter wouldn't melt in his mouth.
- Because, while he may often look as if butter wouldn't melt in his mouth, underneath the boyish appearance and the trappings of trendiness, there is a genuinely steely determination that has to be admired.
- For all they look as if butter wouldn't melt in their mouths, they're an un-Christian lot.
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