perfunctory

perfunctory adjective absent-minded, abstracted, apathetic, below par, careless, casual, cursory, deficient, dispassionate, disregardful, failing, formal, hasty, heedless, hollow, hurried, ill-done, imperfect, inadequate, inattentive, incautious, incomplete, indifferent, inexact, insubstantial, lacking, lax, lenient, lukewarm, mindless, needing, neglectful, negligent, offhand, passionless, poor, poorly done, quick, regardless, requiring, routine, rushed, short, sketchy, speedy, superficial, thoughtless, unattended to, uncaring, unconcerned, undiscerning, unenthusiastic, unexamined, unguarded, unheeded, unheedful, unheeding, uninterested, uninvolved, unmindful, unobservant, unregarded, unresponsive, unstudied, unthinking, unthought of, unwatchful, unweighed, wanting, withhut concern, without enthusiasm

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See also: careless, casual, cursory, inadequate, informal, lax, superficial