I am looking for a word that implies a person would live forever unless they are fatally injured.

Immortal does not suit this purpose as it means a person is not subject to death.

Sample: The vampire is "........" He would live forever unless someone decapitates him.

  • In most vampire-type fiction this is described as something like "essentially immortal" with a bit of explanatory exposition about how they're not subject to aging or disease but can be killed by beheading or a stake through the heart or whatever.
    – 1006a
    Feb 7, 2017 at 1:25
  • 1
    The word immoral has a sense that means "can't die of natural causes" as well as a sense that means "can't die", I've seen it used both ways in fantasy and speculative fiction.
    – ohwilleke
    Feb 7, 2017 at 1:34
  • long-lived, long-lasting.
    – Drew
    Feb 7, 2017 at 1:54

5 Answers 5


Perhaps longeval, also spelled longaeval or longæval, might serve. Per the OED, it means long-lived or long-lasting. Their first citation provided is from 1597.

This word also occurs as a substantive. For example, the pre-Flood patriarchs from the Old Testament were held to be longevals.

Tolkien and Lewis used the term in their writings. For example, from Tolkien’s Letter #245 we read that

The Elves were sufficiently longeval to be called by Man ‘immortal’. But they were not unageing or unwearying. Their own tradition was that they were confined to the limits of this world (in space and time), even if they died, and would continue in some form to exist in it until ‘the end of the world’.

That comes closest to what you’re talking about, although some qualification is required to distinguish the notion of being long-lived from being undying.


Then again, you can’t actually “kill” an elf in Tolkien’s Legendarium. Yes, you can take from them their life — but only for a while. They are part of this world, and their fates are bound to it. Their span is that of the world itself; beyond, none save perhaps Manwë alone can say. They cannot leave the world through a mortal death, for mortal they are not, and slain they will ever return, whether a hundred years from now or a thousand or ten times that, returning in their own flesh again and again and again till the world’s ending. Though Sauron slew Galadriel’s brother Finrod Felagund while the king was defending Beren, The Silmarillion tells us that he lies not in his grave, but that he walks with his father Finarfin beneath the trees in Eldamar, and the Lay of Leithian records that

while Felagund laughs beneath the trees
in Valinor, and comes no more
to this grey world of tears and war.

So perhaps that longeval would be close enough, although it is not strictly speaking undying.

See also this question’s answers for other ideas: Everlasting, Sempiternal, Æviternal, Omniëssent, and Omnitemporal.



: not growing old; timeless, eternal [Merriam Webster's]

He is ageless, Dracula I mean. Only by the sun's flame may he return to the grave.

Actually, vampires are technically undead, so it's not a great example.

No one has actually ever seen the carcass of a great white shark outside of captivity. They are ageless. Only in the maw of an orca or succumbing to the hands of man do we see the great white in death.


Perennial [puh-ren-ee-uh l] \adjective

  1. lasting for an indefinitely long time; enduring.

Source: Dictionary.com


Perhaps perpetual longevity. Even though this concept also has an immortality implied.


I'd say pseudo-immortal or semi-immortal. I've seen both of these words used before in stories with the same meaning that you're trying to get across.

Pseudo-immortal can mean similar to immortality and you could define it afterwards as you wish for your purposes.

Semi-immortal means that they won't die from old age. That might be a better fit since pseudo can mean false or similar, and may confuse some readers.


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