lifeless

lifeless (Dead), adjective abrogated, annihilated, annulled, at rest, bereft of life, breathless, cadaveric, canceled, deceased, defunct, demised, departed, dessitute of life, devoid of life, ended, exanimate, exanimus, expired, extinct, gone, impercipient, inanimate, insensate, insensient, irrecoverable, late, null, passed away, passed on, perished, pulseless, quashed, repealed, unanimated, unfeeling, unrevived, void, without life

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lifeless (Dull), adjective apathetic, arid, banal, barren, benumbing, boring, characterless, colorless, commonplace, deactivated, deadened, debilitated, dismal, dormant, dreary, dronish, dry, empty, exsanguis, feeble, flat, frigidus, hebetudinous, inactive, indolent, inert, inexcitable, insensible, insipid, insulse, lackadaisical, lackluster, laggard, languid, languourness, lazy, leaden, lethargic, lethargical, listless, lumpish, lusterless, monotonous, oscitant, passive, phlegmatic, pococurante, producing boredom, producing ennui, prosaic, quiescent, quiet, slothful, sluggish, somber, spiritless, stagnant, stale, stodgy, stupefied, supine, tame, tedious, tired, tiresome, torpescent, torpid, trite, unaroused, uncaptivating, unenlivened, unentertaining, unenthusiastic, unfeeling, unfertile, unimaginative, unimpassioned, uninspired, uninspiring, uninventive, unlively, unoriginal, unresponsive, unsparkling, unspirited, unvivid, usual, vapid, vegatating, vegetative, weak, wearisome, wearying

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See also: dead, deceased, defunct, languid, mediocre, otiose, pedestrian, phlegmatic, ponderous, stagnant, torpid