Etymology
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desensitize (v.)

1904; see de- "do the opposite of" + sensitize. Originally of photography development; psychological sense "free from a neurosis" is by 1935. Meaning "make or become insensitive" is by 1955. Related: Desensitized; desensitizing; desensitization.

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Definitions of desensitize

desensitize (v.)
cause not to be sensitive;
The photographic plate was desensitized
The war desensitized many soldiers
Synonyms: desensitise
desensitize (v.)
make insensitive;
His military training desensitized him
Synonyms: desensitise
From wordnet.princeton.edu