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The Collaborative International Dictionary of English v.0.48 (gcide)

Callous \Cal"lous\, a. [L. callosus callous hard, fr. callum,
callus, callous skin: cf. F. calleux.]
1. Hardened; indurated. "A callous hand." --Goldsmith. "A
callous ulcer." --Dunglison.
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2. Hardened in mind; insensible; unfeeling; unsusceptible.
"The callous diplomatist." --Macaulay.
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It is an immense blessing to be perfectly callous to
ridicule. --T. Arnold.

Syn: Obdurate; hard; hardened; indurated; insensible;
unfeeling; unsusceptible. See {Obdurate}. --
{Cal"lous*ly}, adv.
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A callousness and numbness of soul. --Bentley.
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