stone cold

Unfeeling, insensible, as in That sad story left her stone cold. This analogy was already used by Shakespeare in Henry V (2:3): “Cold as any stone.”

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.