Webster's English Dictionary

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callous

1. cal.lous \'kal-*s\ aj [MF calleux, fr. L callosus, fr. callum, callus 
   callous] skin; akin to Skt kinsub-dot>a callosity 1a: hardened and 
   thickened  1b: having calluses  2a: feeling no emotion  2b: feeling no 
   sympathy for others  - cal.lous.ly av
2. callous vt : to make callous