insensible

adjective6

1. •
   Incapable or deprived of physical sensation.
2. •
   Incapable of mental feeling; indifferent.

   • Lost in their loves, insensible of shame. — 1697
3. •
   Incapable of emotional feeling; callous; apathetic.
4. •
   Unable to be perceived by the senses.

   • Two small and almost insensible pricks were found upon Cleopatra's arm. — 1650
5. •
   Unable to be understood; unintelligible.
6. •
   Not sensible or reasonable; meaningless.

   • If it make the indictment be insensible or uncertain, […]it shall be quashed. — 1736