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callous

[kal-uh s] /ˈkæl əs/
adjective
1.
made hard; hardened.
2.
insensitive; indifferent; unsympathetic:
They have a callous attitude toward the sufferings of others.
3.
having a callus; indurated, as parts of the skin exposed to friction.
verb (used with object), verb (used without object)
4.
to make or become hard or callous.
Origin of callous
late Middle English
1375-1425
1375-1425; late Middle English < Latin callōsus hard-skinned, tough, equivalent to call(um) tough skin, any hard substance + -ōsus -ous
Related forms
callously, adverb
callousness, noun
uncallous, adjective
uncallously, adverb
uncallousness, noun
Can be confused
callous, callus.
Synonyms
1. hard. 2. inured, insensible, obtuse. See hard.
Antonyms
1. soft. 2. sensitive.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for callousness

callous

/ˈkæləs/
adjective
1.
unfeeling; insensitive
2.
(of skin) hardened and thickened
verb
3.
(pathol) to make or become callous
Derived Forms
callously, adverb
callousness, noun
Word Origin
C16: from Latin callōsus; see callus
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for callousness

callous

adj.

c.1400, "hardened," in the physical sense, from Latin callosus "thick-skinned," from callus, callum "hard skin" (see callus). The figurative sense of "unfeeling" appeared in English by 1670s. Related: Callously; callousness.

Online Etymology Dictionary, © 2010 Douglas Harper
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callousness in Medicine

callous cal·lous (kāl'əs)
adj.
Of, relating to, or characteristic of a callus or callosity.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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