insensitive

[in-sen-si-tiv]
adjective
1.
deficient in human sensibility, acuteness of feeling, or consideration; unfeeling; callous: an insensitive person.
2.
not physically sensitive: insensitive skin.
3.
not affected by physical or chemical agencies or influences: insensitive to light.
4.
not readily responsive or aware: insensitive to the needs of the peasants.

Origin:
1600–10; in-3 + sensitive

insensitiveness, insensitivity, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
insensitive (ɪnˈsɛnsɪtɪv)
 
adj (foll by to)
1.  lacking sensitivity; unfeeling
2.  lacking physical sensation
3.  not sensitive (to) or affected (by): insensitive to radiation
 
in'sensitively
 
adv
 
in'sensitiveness
 
n
 
insensi'tivity
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

insensitive
1610, "having little or no reaction to what is perceived by one's senses," from in- "not" + sensitive. See insensate.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Scripts were revised to delete material that might be construed as insensitive.
The resulting device is robust and reasonably insensitive to heat.
Megan actually has a rare genetic disorder that renders her insensitive to pain.
The float is weighted to make it insensitive to high-frequency motion.
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