Etymology

callous

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Today it means: Emotionally hardened; unfeeling and indifferent to the suffering/feelings of others. Full definition →

Latin callōsus
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The story

  1. Latin · derived fromcallōsus“hard-skinned”
  2. English todaycallous

From Latin callōsus (“hard-skinned”), from callum (“hardened skin”) + -ōsus.

Etymology from Wiktionary, CC BY-SA 4.0.