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Related to lifeless: selfless
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inanimate, insensate, insensient, irrecoverable, late, null, passed away, passed on, perished, pulseless, quashed, repealed, unanimated, unfeeling, unrevived, void, without life
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
See also: dead, deceased, defunct, languid, mediocre, otiose, pedestrian, phlegmatic, ponderous, stagnant, torpid