uninquiring
uninquisitive
uninterested
absent
absentminded
abstracted
aloof
apathetic
ataractic
blase
bored
careless
casual
detached
devil-may-care
disinterested
dispassionate
disregardant
disregardful
distant
distracted
distrait
distraught
easygoing
heedless
impassive
inadvertent
inattentive
indifferent
inexcitable
inobservant
insouciant
lackadaisical
listless
mindless
negligent
nonchalant
perfunctory
phlegmatic
pococurante
preoccupied
reckless
regardless
remote
stolid
thoughtless
turned-off
unanxious
averse
best-equipped
emotionless
expressionless
inexpressive
lack-lustre
noncommittal
oblivious
sightless
uncomprehending
unembarrassed
uneventful
unfitted
unfocused
unimpressed
uninstructed
uninvolved
unlined
unobservant
unreadable
unsurprised
unsympathetic
untroubled