Remiss

a.	1.	Not energetic or exact in duty or business; not careful or prompt in fulfilling engagements; negligent; careless; tardy; behindhand; lagging; slack; hence, lacking earnestness or activity; languid; slow. Thou never wast remiss, I bear thee witness. - Milton. These nervous, bold; those languid and remiss. - Roscommon. Its motion becomes more languid and remiss. - Woodward.
n.	1.	The act of being remiss; inefficiency; failure.

Adj.

1.

remiss - failing in what duty requires; "derelict (or delinquent) in his duty"; "neglectful of his duties"; "remiss of you not to pay your bills" Synonyms: delinquent, derelict, neglectful

Micawberish, backward, behindhand, bone-lazy, cadging, culpably negligent, dallying, delaying, derelict, dilatory, dillydallying, disregardful, do-nothing, doless, dronish, drony, easy, easygoing, ergophobic, faineant, foot-dragging, good-for-nothing, heedless, impotent, imprecise, inadvertent, inattentive, indifferent, indolent, lackadaisical, laggard, lagging, laissez-faire, lazy, lenient, lingering, loitering, loose, neglectful, neglecting, nonaggressive, noninterfering, nonrestrictive, off-guard, overindulgent, overly permissive, overpermissive, parasitic, permissive, procrastinating, procrastinative, procrastinatory, regardless, relaxed, scamping, scrounging, shiftless, shuffling, skimping, slack, slighting, slipshod, slothful, slow, sluggish, slurring, soft, sponging, thoughtless, uncircumspect, unenterprising, unguarded, unheeding, unmindful, unrestrained, unrigorous, unthinking, unwary, unwatchful, weak, work-shy