look as if butter wouldn't melt
see butter wouldn't melt.
Kindness Quotes That Will Forever Melt Your HeartRead more in this article about some frequently asked questions and fun facts related to our definitions.
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.