Adjective for withstanding the passage of time

Is there an adjective meaning that an idea or object has longevity, or will still be relevant in the future?

(I believe I’ve heard such a word, but I can’t think of it at the moment.)

Usage example:

While this textbook is interesting, it does not seem particularly [?]; five years from now, it will be useless.

Answer

There are a number of possible synonyms:

eternal, lasting, permanent, enduring, abiding, immortal, everlasting,
ceaseless, immutable, indestructible, undying, ageless, imperishable,
changeless.

The word required in your example, however, might be definitive, which carries the sense of being authoritative.

Attribution
Source : Link , Question Author : jtbandes , Answer Author : Barrie England

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