Synonyms of the word

undying

• adj. permanent; never-ending; infinite.
• v. present participle of undie.

deathless

• adj. Undying or immortal.
• adj. Of a work of art or literature: conspicuously excellent, of the highest order, guaranteed not to be lost…

immortal

• adj. Not susceptible to death; living forever; never dying.
• adj. Never to be forgotten; that merits being always remembered.
• adj. Connected with or relating to immortality.
• adj. (obsolete) Exceedingly great; excessive; grievous.
• n. One who is not susceptible to death.
• n. A member of an elite regiment of the Persian army.
• n. A member of the Académie française.
• n. (Internet) An administrator of a multi-user dungeon; a wizard.