| old(permanent, long-term, lifelong) | |
| ongoing(permanent, long-term, lifelong) | |
| overlong | |
| perdurable(stable, constant, enduring, lasting, permanent) | |
| perduring(adjective, stable, constant, vast, enduring) | |
| perennial(adjective, stable, constant, enduring, lasting) | |
| period | |
| persisting(permanent, long-term, lifelong) | |
| protracted | |
| relentless(lasting, permanent, on, everlasting, unending) | |
| relentlessly(adverb, relentless, unremitting, usually, continuously) | |
| set in concrete(expression, adjective, stable, constant, vast) | |
| set in stone(expression, adjective, idiom, stable, constant) | |
| span | |
| stable(constant, enduring, lasting, permanent, perpetual) | |
| termless(adjective, vast, lasting, permanent, everlasting) | |
| throughout the ages(expression, idiom) | |
| timeless(adjective, vast, lasting, permanent, everlasting) | |
| timelessness(noun, age, future, infinity, perpetuity) | |
| to infinity |
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| APA | Smart Define. (2015). forever thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/forever/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "forever thesaurus" https://smartdefine.org/forever/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, forever thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/forever/thesaurus/synonyms>. |
| MLA | Smart Define. "forever thesaurus" 15 December 2015. Web. 22 September 2026. <https://smartdefine.org/forever/thesaurus/synonyms> |