callous
dead
deadened
dull
indurate
insensible
numb
pachydermatous
soulless
thick-skinned
tough-skinned
unaffected
unreactive
Philistine
aloof
anesthetic
anesthetized
asleep
benumbed
blanket
bloodless
boorish
caddish
calloused
case-hardened
casual
coarse
cold
cold of heart
coldblooded
coldhearted
crude
flinthearted
flinty
general
hard
hard of heart
hardened
hardhearted
heartless
ill-bred
impassible
impassive
imperceptive
impercipient
impervious
imprudent
inconsiderate
incurious
indifferent
indiscreet
indiscriminate
indiscriminative
indurated
insensate
insentient
inured
abusive
arrogant
egotistical
ill-mannered
illiterate
inappropriate
incompetent
inept
irresponsible
presumptuous
self-absorbed
self-centered
thoughtless
unable
uncaring
uncivilized
uneventful
ungrateful
uninterested
unkind
unscientific
hypersensitive
oversensitive
sensitive