Definition of callous
(Entry 1 of 2)
1a
: being hardened and thickened
b
: having calluses
callous hands
2a
: feeling no emotion
b
: feeling or showing no sympathy for others : hard-hearted
a callous indifference to suffering
callous
verb
calloused; callousing; callouses
Definition of callous (Entry 2 of 2)
: to make callous
hands calloused by hard manual labor
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Merriam-Webster unabridged
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Time Traveler for callous
The first known use of callous was in the 14th century
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