(a.) Not attentive; not fixing the mind on an object; heedless; careless; negligent; regardless; as, an inattentive spectator or hearer; an inattentive habit.

apathetic artless ataractic blase careless casual culpably negligent derelict devil-may-care disinterested dispassionate disregardant disregardful distracted distrait 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 negligent nonadherent nonchalant noncompliant nonconforming noninterfering nonobservant nonrestrictive off-guard overly permissive pedestrian perfunctory permissive pococurante poor procrastinating reckless regardless relaxed remiss scamping skill-less skimping slack slighting slurring thoughtless turned-off unanxious unapt uncircumspect uncompliant unconcerned unconforming undeft undexterous undextrous undiscriminating unfacile unfaithful unguarded unheedful unheeding unintelligent uninterested unloyal unmarking unmindful unnoticing unnoting unobservant unobserving unperceiving unproficient unremarking unrigorous unskillful unsolicitous untrue unwary unwatchful