1. (a.) Unable to move or act; not reactive with other elements; as, an inert gas will not ignite\.

2. (a.) Indisposed to move or act; very slow to act; sluggish; dull; inactive; indolent; lifeless.

3. (a.) Not having or manifesting active properties; not affecting other substances when brought in contact with them; powerless for an expected or desired effect.

abeyant abiotic apathetic asleep azoic benumbed blase bored cataleptic catatonic changeless constant contemplative dead debilitated do-nothing dopey dormant droopy drugged dull dumb enervated exanimate flat foul groggy heavy hebetudinous idle immobile immutable impassive impotent in abeyance in suspense inactive inanimate inanimated incommutable inconvertible indefeasible indolent insensate insensible insentient insusceptible of change intransmutable invariable irretrievable irreversible irrevocable jaded lackadaisical laissez-aller laissez-faire languid languorous lasting latent lazy leaden lethargic lifeless listless logy lumpish meditative moribund motionless mute neuter neutral noble nonconscious nonliving nonreturnable nonreversible numb otiose paralytic paralyzed passive permanent phlegmatic pooped powerless procrastinating quiescent quiet quietist quietistic reverseless sated sedentary senseless slack sleeping sleepy slothful slow sluggish slumbering smoldering somnolent soulless stagnant stagnating standing standpat static stationary still stolid stultified supine suspended tame torpid unalterable unalterative unaltered unanimated unaroused unchangeable unchanged unchanging unconscious undeflectable undeviating unfeeling unmodifiable unremitting unresponsive unrestorable unreturnable unsusceptible unvariable unvarying vegetable vegetative wan weary world-weary