Synonyms of undying

2 Syllables
yearlong, long-term, deathless, termless, constant, endless, lasting, longterm
3 Syllables
perennial, persistent, continuing, perpetual, unended, eternal, longstanding, timeless, immortal, unfading, unending, permanent, unceasing
4 Syllables
sempiternal, measureless, everlasting, infinite, never-ceasing, phoenixlike
5 Syllables
irrefragable, irrefrangible, self-perpetuating, amaranthine, undiminished, nonperishable, illimitable, interminable, imperishable, indestructible
6 Syllables
inexterminable, inextinguishable