imperishable

1 impossible to destroy <energy is imperishable> Synonyms indestructible, inextinguishableRelated Words incorruptible; deathless, immortal, perpetual, undying; indelible, indissoluble, ineffaceable, ineradicable, inexpungible; durable, enduring, everlasting, lasting, permanent, unbreakable; strong, sturdy, toughNear Antonyms mortal; impermanent, transient, transitory; breakable, delicate, flimsy, fragile, frailAntonyms destructible, extinguishable, perishable

2 having an existence or validity that does not change or diminish <the belief that through military glory one could achieve imperishable fame> Synonyms ageless, continuing, dateless, enduring, eternal, everlasting, immortal, abiding, lasting, ongoing, perennial, perpetual, timeless, undyingRelated Words ceaseless, endless, permanent; changeless, constant, stable, stationary, steady, unchanging, unvaryingNear Antonyms antiquated, archaic, dated, obsolete, outdated, outmoded, out-of-date, outworn, passé