disregardful (?.)
- airy
- apathetic
- arrogant
- ataractic
- audacious
- behindhand
- blase
- bold
- brash
- brassy
- brazen
- bumptious
- careless
- casual
- challenging
- cheeky
- cocky
- contemptuous
- cursory
- daring
- defiant
- defying
- degage
- derisive
- devil-may-care
- disdainful
- disinterested
- dispassionate
- disregardant
- distracted
- distrait
- easygoing
- flippant
- forgetful
- free and easy
- greatly daring
- heedless
- impertinent
- impudent
- inadvertent
- inattentive
- inconsiderate
- inconstant
- incurious
- indifferent
- inexcitable
- inobservant
- insolent
- insouciant
- lackadaisical
- lazy
- listless
- mindless
- negligent
- nonadherent
- nonchalant
- noncompliant
- nonconforming
- nonobservant
- oblivious
- offhand
- perfunctory
- pert
- pococurante
- reckless
- regardless
- regardless of consequences
- remiss
- respectless
- saucy
- slack
- tactless
- thoughtless
- turned-off
- unaccommodating
- unanxious
- uncomplaisant
- uncompliant
- unconcerned
- unconforming
- uncooperative
- undiplomatic
- undiscriminating
- unfaithful
- unheedful
- unheeding
- unhelpful
- uninterested
- unloyal
- unmarking
- unmindful
- unnoticing
- unnoting
- unobliging
- unobservant
- unobserving
- unprepared
- unready
- unremarking
- unsolicitous
- untactful
- unthinking
- unthoughtful
- untrue
