D defs.my
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Entry 2 senses Webster, 1913

Callous

/kăl'-əs/ · Cal·lous · IPA /ˈkæləs/
01 a. Hardened; indurated.
  1. 1.
    Hardened; indurated.
  2. 2.
    Hardened in mind; insensible; unfeeling; unsusceptible.
    “It is an immense blessing to be perfectly callous to ridicule.” — T. Arnold.
    “A callousness and numbness of soul.” — Bentley.
Syn. Obdurate; hard; hardened; indurated; insensible; unfeeling; unsusceptible. See Obdurate.