Callous

1. adjective

   having calluses; having skin made tough and thick through wear

   “calloused skin”

   Similar: calloused, thickened

2. verb

   make insensitive or callous; deaden feelings or morals

   Similar: cauterize, cauterise

3. adjective

   emotionally hardened

   “a callous indifference to suffering”

   Similar: indurate, pachydermatous