TORPID

adj. sluggish, slow, slow-moving, slow-paced, tortoise-like, lethargic, apathetic, indolent, passive, slothful, dull, stupefied, sleepy, somnolent, inactive, inert, languid, languorous, phlegmatic, spiritless, lifeless, listless, fainéant, lackadaisical, pococurante, indifferent, uncaring, unconcerned, insouciant Johnson said that it is a man's own fault if his mind grows torpid in old age