inconsiderate
unconsidered
unreflective
unthinking
unthoughtful
absent-minded
airy
apish
arbitrary
artless
asinine
batty
befooled
beguiled
besotted
blank
blankminded
brainless
brash
buffoonish
calm
capricious
careless
casual
cockeyed
crazy
credulous
cursory
daffy
daft
dazed
degage
discourteous
disregardant
disregardful
dissipated
distracted
distrait
dizzy
doting
dull
dumb
easygoing
empty
empty-headed
fatuitous
fatuous
featherbrained
featherheaded
feckless
flaky
flippant
fluttery
fond
childish
foolish
frivolous
good-natured
heartless
heedless
impulsive
insolent
irresponsible
light-hearted
perverse
senseless
sinful
wanton