lax

lax adjective absentminded, apathetic, careless, derelict, disorganized, disregarding, dissolutus, forgetful, halfhearted, heedless, idle, imprecise, imprudent, inaccurate, inadvertent, inattentive, incautious, indifferent, indolent, inexact, lackadaisical, lazy, loose, mindless, neglectful, neglegens, negligent, nonaggressive, oblivious, perfunctory, pococurante, regardless, remiss, remissus, slack, slipshod, slothful, slovenly, sluggish, temerarious, thoughtless, unambitious, unapprehensive, unaspiring, unaware, uncaring, uncircumspect, undemanding, unenterprising, unguarded, uninterested, unmindful, unobservant, unobserving, unstrict, unthinking, unthorough, unthoughtful, untidy, unwary, unwatchful

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See also: careless, cursory, derelict, improvident, indolent, negligent, peccable, perfunctory, promiscuous, remiss, slipshod, superficial, uncurbed