1. heart of stone - Noun
2. heart of stone - Phrase
heart of stone (plural hearts of stone)
(figuratively, idiomatic) A stonehearted character, stern or cruel nature.
She's got a heart of stone.
A scientific man ought to have no wishes, no affections, - a mere heart of stone. Charles Darwin
This creature softened my heart of stone. She died and with her died my last warm feelings for humanity. Joseph Stalin
One must have a heart of stone to read the death of little Nell without laughing. Oscar Wilde
The urge to run, the restlessness. The heart of stone I sometimes get. The things I've done for foolish pride. The me that's never satisfied. That face that's in the mirror. When I don't like what I see. I guess that's just the cowboy in me. Tim McGraw
Under that heart of stone beat muscles of pure flint. Sid Waddell
God's eternal laws are kind-and break the heart of stone. Oscar Wilde