enduring
v.v. lasting for a long time, even when things are difficult. You use this to describe something strong that does not fade or break easily.
v. lasting over a long period; durable or persistent. Often describes abstract qualities like love, appeal, or success that survive despite challenges.
The book has an enduring appeal for readers of all ages.
Despite the changing political climate, the two nations maintained an enduring friendship based on mutual respect.
The architect's enduring legacy is visible in the city's skyline, where his innovative designs continue to influence new generations of builders decades after his death.
Typically placed before the noun it modifies; often paired with abstract nouns like 'legacy', 'appeal', or 'friendship'.