(a.) Not curious or inquisitive; without care for or interest in; inattentive; careless; negligent; heedless.

absent absentminded abstracted aloof apathetic ataractic blase bored careless casual detached devil-may-care disinterested dispassionate disregardant disregardful distant distracted distrait distraught easygoing heedless impassive inadvertent inattentive indifferent inexcitable inobservant insouciant lackadaisical listless mindless negligent nonchalant perfunctory phlegmatic pococurante preoccupied reckless regardless remote stolid thoughtless turned-off unanxious unconcerned undiscriminating unheedful unheeding uninquiring uninterested uninvolved unmarking unmindful unnoticing unnoting unobservant unobserving unremarking unsolicitous withdrawn