| exhaustlessness | |
| forever and a day(noun, expression, adjective, adverb, age) | |
| forever and aye(expression, idiom) | |
| frequently | |
| future(noun, age, infinity, perpetuity) | |
| illimitability | |
| illimitably | |
| immeasurably | |
| immensely | |
| immutable(adjective, stable, constant, enduring, lasting) | |
| imperishability(noun, age, future, infinity, perpetuity) | |
| imperishable(adjective, stable, constant, enduring, lasting) | |
| in for the long haul(expression, adjective, idiom, stable, lasting) | |
| incalculably | |
| incessant(permanent, everlasting, unending, long-term, undying) | |
| incomprehensibility | |
| incomprehensibly | |
| indefinite(lasting, permanent, everlasting, unending, undying) | |
| indefinitely | |
| indelible(adjective, permanent, long-term, lifelong) |
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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> |