Etymology
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insensitive (adj.)

c. 1600, "having little or no reaction to what is perceived by one's senses," from in- (1) "not, opposite of" + sensitive. For sense, see insensate. From 1834 as "having little or no mental or moral sensitiveness;" meaning "without consideration for the feelings of others" attested by 1974. Related: Insensitively.

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Definitions of insensitive

insensitive (adj.)
not responsive to physical stimuli;
insensitive to radiation
insensitive (adj.)
deficient in human sensibility; not mentally or morally sensitive;
insensitive to the needs of the patients
From wordnet.princeton.edu