Learn English – Adjective for withstanding the passage of time

adjectivessingle-word-requests

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.

Best 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.

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