asleep
benumbed
callous
dead
deadened
dull
impassible
imperceptive
impercipient
insensate
insensible
insensitive
insentient
numb
numbed
obdurate
obtuse
thick-skinned
thick-witted
unfeeling
unperceptive
nonphysical
unacknowledged
uncared
uncollected
unconsidered
undetected
unenvied
unexamined
unexperienced
unexplored
unguessed
unguessed-at
unheard
unheeded
unimagined
unnoted
unobserved
unrecognized
unremarked
unreported
unrepresented
unshared
unthought-of