Webster's Revised Unabridged Dictionary · 1913

Insensible

Insensible , adjective

[Latin insensibilis: compare French insensible. See In- not, and Sensible.]

1.
Destitute of the power of feeling or perceiving; wanting bodily sensibility; unconscious. — Milton
2.
Not susceptible of emotion or passion; void of feeling; apathetic; unconcerned; indifferent; as, insensible to danger, fear, love, etc.; -- often used with of or to.
Accept an obligation without being a slave to the giver, or insensible to his kindness. — Sir H. Wotton
Lost in their loves, insensible of shame. — Dryden
3.
Incapable of being perceived by the senses; imperceptible. Hence: Progressing by imperceptible degrees; slow; gradual; as, insensible motion.
Two small and almost insensible pricks were found upon Cleopatra's arm. — Sir T. Browne
They fall away, And languish with insensible decay. — Dryden
4.
Not sensible or reasonable; meaningless. [Obsolete]
If it make the indictment be insensible or uncertain, it shall be quashed. — Sir M. Hale
5.
Incapable of feeling a specific sensation or emotion; as, insensible to pity.