butter wouldn't melt in sb's mouth
used when someone looks as if they would never do anything wrong, although you feel they might:
Tommy looked as if butter wouldn't melt in his mouth.
Thesaurus: synonyms and related words
Naive & trusting
- an easy touch idiom
- be easy game/meat idiom
- be easy prey idiom
- be wet behind the ears idiom
- butter
- easy
- idealist
- impressionable
- ingenuous
- jejune
- prey
- pushover
- see things in black and white idiom
- simple
- soft touch
- sucker
- unsophisticated
- unsuspecting
- wet
- wide-eyed
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