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key-cold Completely lacking in personal warmth and compassion; emotionally frigid; apathetic. This expression is derived from a key’s metallic coldness, a property which was once thought to remedy nosebleeds. This obsolete phrase saw its heyday during the 1500s.
The consideration of his incomparable kindness could not … tail to inflame our key-cold hearts. (Sir Thomas More, Comfort Against Tribulation, 1534)
weep millstones Said sarcastically of a callous, hard-hearted person, implying that he is not likely to weep at all. This expression is probably derived from The Tale of Beryn (1400):
Tears … as great as any millstone. Since a millstone is a large stone that grinds grain in a mill, its use here is, of course, hyperbolic. This expression was used several times by Shakespeare; for example, in Richard III, Gloucester states:
Your eyes drop millstones, when fool’s eyes drop tears. (I, iii)
|Noun||1.||callousness - devoid of passion or feeling; hardheartedness|
insensitiveness, insensitivity - the inability to respond to affective changes in your interpersonal environment
dullness - lack of sensibility; "there was a dullness in his heart"; "without him the dullness of her life crept into her work no matter how she tried to compartmentalize it."