unheedful (?.)
- airy
- careless
- casual
- cursory
- degage
- disregardant
- disregardful
- distracted
- distrait
- easygoing
- flippant
- forgetful
- free and easy
- heedless
- inadvertent
- inattentive
- inconsiderate
- incurious
- indifferent
- inobservant
- insouciant
- lazy
- mindless
- negligent
- oblivious
- offhand
- perfunctory
- reckless
- regardless
- respectless
- tactless
- thoughtless
- unaccommodating
- uncomplaisant
- uncooperative
- undiplomatic
- unheeding
- unhelpful
- unmarking
- unmindful
- unnoticing
- unnoting
- unobliging
- unobservant
- unobserving
- unprepared
- unready
- unremarking
- unsolicitous
- untactful
- unthinking
- unthoughtful
