Etymology
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insensible (adj.)

c. 1400, "lacking the power to feel with the senses, numb, dazed" (now rare in this meaning), from Late Latin insensibilis "that cannot be felt," from in- "not" (see in- (1)) + sensibilis "having feeling: perceptible by the senses" (see sensible). Meaning "void of feeling, not susceptible to emotion or passion" is from 1610s. Meaning "incapable of being felt or perceived by the senses or the mind, so small or slight as to be imperceptible" is from late 14c. Compare insensate.

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Definitions of insensible

insensible (adj.)
unaware of or indifferent to;
insensible to the suffering around him
Synonyms: unaffected
insensible (adj.)
incapable of physical sensation;
insensible earth
insensible to pain
insensible (adj.)
barely able to be perceived;
an almost insensible change
insensible (adj.)
unresponsive to stimulation;
he lay insensible where he had fallen
Synonyms: senseless / out of it
From wordnet.princeton.edu