INERT

adj. 1 inactive, unreactive, unresponsive, neutral Argon, xenon, and neon are inert gases 2 motionless, immobile, inanimate, lifeless, still, quiet, quiescent, stationary, static He was mute and inert it was like talking to a zombie 3 sluggish, slow, torpid, dull, inactive, idle, indolent, lazy, slothful, leaden, slack, passive, supine, dormant, otiose, listless, languid or languorous I contemplated the inert bodies sunbathing around the swimming-pool