WordNet sense 1 ((followed by `to') not showing human feeling or sensitivity; unresponsive):

dead

WordNet sense 2 (deficient in human sensibility; not mentally or morally sensitive):

insensitive

WordNet sense 3 (lacking sensation):

benumbed, asleep

WordNet sense 4 (incapable of physical sensation):

insensible

WordNet sense 5 (make numb or insensitive):

benumb, blunt, dull

WordNet sense 6 (so frightened as to be unable to move; stunned or paralyzed with terror):

petrified

WordNet sense 7 (filled with fear or apprehension):

afraid