1. (a.) Not careful or promptly fulfilling a duty; negligent; careless; tardy; behindhand; lagging; slack; hence, lacking earnestness or activity; languid; slow.
2. (n.) The act of being remiss; inefficiency; failure.
Thesaurus Entries
Micawberish, backward, behindhand, bone-lazy, cadging, careless, culpably negligent, dallying, delaying, delinquent, derelict, dilatory, dillydallying, disregardful, do-nothing, doless, dronish, drony, easy, easygoing, ergophobic, faineant, foot-dragging, forgetful, good-for-nothing, heedless, impotent, imprecise, inadvertent, inattentive, indifferent, indolent, lackadaisical, laggard, lagging, laissez-faire, lax, lazy, lenient, lingering, loitering, loose, neglectful, neglecting, negligent, nonaggressive, noninterfering, nonrestrictive, off-guard, overindulgent, overly permissive, overpermissive, parasitic, permissive, procrastinating, procrastinative, procrastinatory, regardless, relaxed, scamping, scrounging, shiftless, shuffling, skimping, slack, slighting, slipshod, sloppy, slothful, slow, sluggish, slurring, soft, sponging, thoughtless, uncircumspect, unenterprising, unguarded, unheeding, unmindful, unrestrained, unrigorous, unthinking, unwary, unwatchful, weak, work-shy
