undying

1 having an existence or validity that does not change or diminish his undying devotion to his terminally ill wife is truly inspiring Synonyms ageless, continuing, dateless, enduring, eternal, everlasting, immortal, imperishable, lasting, ongoing, perennial, perpetual, timeless, abidingRelated Words ceaseless, endless, permanent; changeless, constant, stable, stationary, steady, unchanging, unvaryingNear Antonyms antiquated, archaic, dated, obsolete, outdated, outmoded, out-of-date, outworn, passé

2 lasting forever a duet in which the singers swear undying love for one another Synonyms ceaseless, dateless, deathless, endless, eternal, immortal, permanent, perpetual, everlasting, unendingRelated Words durable, enduring, lasting, long-lived, persistent, stubborn; imperishable, indefeasible, indefectible, indelible, indestructible, indissoluble, inexpungible; timeless; abiding, stable, standing, steadfast, steady, unfailing, unfaltering; continual, continuing, continuous, incessant, unbroken, unceasing, uninterrupted, unremittingNear Antonyms ephemeral, evanescent, fleeting, fugacious, fugitive, momentary, passing, short-lived, transitory; interim, provisional, short-termAntonyms impermanent, mortal, temporary, transient