Perfunctory

1. (a.) Done merely to get rid of a duty; done in a careless and superficial manner; characterized by indifference; as, perfunctory admonitions.

2. (a.) Hence: Mechanical; indifferent; listless; careless.

Thesaurus Entries

Laodicean, airy, apathetic, at odds, ataractic, automatic, averse, backward, balking, balky, blase, businesslike, careless, casual, cold, cool, cursory, degage, devil-may-care, differing, dilatory, disagreeing, disinclined, disinterested, dismissive, disobedient, dispassionate, disregardant, disregardful, distant, easygoing, fervorless, fleeting, flippant, forced, forgetful, formal, fractious, free and easy, grudging, halfhearted, hasty, heedless, hurried, impersonal, inattentive, inconsiderate, incurious, indifferent, indisposed, indocile, inexcitable, insouciant, involuntary, lackadaisical, laggard, lazy, listless, loath, lukewarm, mechanical, mindless, mutinous, negligent, neuter, neutral, nonchalant, oblivious, offhand, opposed, pococurante, recalcitrant, reckless, refractory, regardless, reluctant, removed, renitent, resistant, respectless, restive, routine, rushed, sketchy, slipshod, slovenly, slow, slow to, spotty, standard, stock, sulky, sullen, superficial, tactless, tepid, thoughtless, turned-off, unanxious, unaware, unconcerned, unconsenting, undiplomatic, undiscriminating, unenthusiastic, unheedful, unheeding, uninterested, uninvolved, unmindful, unprepared, unready, unsolicitous, untactful, unthinking, unwilling, unzealous, usual, wooden, zealless