1
a
: being hardened and thickened
b
: having calluses
callous hands
2
a
: feeling no emotion
b
: feeling or showing no sympathy for others : hard-hearted
a callous indifference to suffering
callously
adverb
callousness
noun
calloused; callousing; callouses
: to make callous
hands calloused by hard manual labor
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Merriam-Webster unabridged
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