absent
absent-minded
abstracted
distracted
distrait
dreamy
drowsy
forgetful
moony
negligent
oblivious
oscitant
scatty
woolgathering
yawning
apathetic
artless
ataractic
blase
careless
casual
culpably negligent
derelict
devil-may-care
disinterested
dispassionate
disregardant
disregardful
distraught
easygoing
half-assed
heedless
inadept
inadvertent
inapt
inconstant
incurious
indifferent
inefficient
inept
inexcitable
inexpert
inobservant
insouciant
lackadaisical
laissez-faire
lax
listless
loose
mediocre
mindless
neglectful
neglecting
nonadherent
nonchalant
indolent
insensible
lethargic
purposeless
remiss
slothful
slovenly
thoughtless
torpid
unable
uninformed
unintelligent
uninterested
unmindful
unobservant
unsympathetic
unwilling
attentive
disincentive
incentive
inventive
preventive