airy
blanket
brash
careless
casual
cursory
degage
disregardant
disregardful
easygoing
flippant
forgetful
free and easy
general
heedless
impolitic
imprudent
inconsiderate
indifferent
indiscreet
indiscriminate
indiscriminative
insensitive
insouciant
lazy
maladroit
nonjudgmental
oblivious
offhand
perfunctory
promiscuous
reckless
regardless
respectless
tactless
thoughtless
uncritical
uncriticizing
undemanding
undifferentiating
undiplomatic
undiscreet
undiscriminating
undiscriminative
unexacting
unfastidious
unheedful
unheeding
unmeticulous
unmindful