| indestructible(stable, constant, enduring, lasting, permanent) | |
| indissoluble(permanent, long-term, lifelong) | |
| inexhaustibility | |
| innumerability | |
| invariable(adjective, stable, constant, enduring, lasting) | |
| kingdom come(noun, expression, age, future, infinity) | |
| lapse | |
| lasting(adjective, stable, constant, vast, enduring) | |
| lastingness(noun, perpetuity) | |
| lifelong(permanent, long-term) | |
| limitless period | |
| limitlessly | |
| limitlessness | |
| long-lasting(stable, constant, enduring, lasting, permanent) | |
| long-term(adjective, vast, permanent, lifelong, diurnal) | |
| longstanding(adjective, vast, permanent, long-term, lifelong) | |
| measurelessly | |
| measurelessness | |
| non-stop | |
| numberlessness |
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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> |