Originally Posted by 94civicEX

Try; behindhand, careless, delinquent, derelict, dilatory, disregardful, dormant, dull, easy-going, fainéant, idle, inactive, inattentive, indolent, inert, lackadaisical, lax, lethargic, neglectful, negligent, not busy, permissive, quiescent, quiet, regardless, remiss, slothful, slow, slow-moving, sluggish, stagnant or tardy.