- Definitions|2
- Thesaurus|505
- Abbreviations|0
| for keeps(expression, stable, constant, enduring, lasting) | |
| forever and a day(expression, idiom, stable, constant, lasting) | |
| frozen | |
| green | |
| immemorial(vast, lasting, permanent, everlasting, unending) | |
| immortalization | |
| immutable(adjective, stable, fixed, constant, enduring) | |
| impregnable | |
| imputrescible | |
| in for the long haul(expression, idiom, stable, constant, lasting) | |
| incessant(adjective, perpetuity) | |
| indeciduous | |
| indefinite(lasting, permanent, everlasting, unending, undying) | |
| ineffaceable | |
| inexpugnable | |
| invariable(stable, fixed, constant, enduring, lasting) | |
| invincible | |
| invulnerable | |
| irreducible | |
| irrefragable |
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| APA | Smart Define. (2016). imperishable thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/imperishable/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "imperishable thesaurus" https://smartdefine.org/imperishable/thesaurus/synonyms (accessed September 21, 2026). |
| Harvard | Smart Define 2016, imperishable thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/imperishable/thesaurus/synonyms>. |
| MLA | Smart Define. "imperishable thesaurus" 29 March 2016. Web. 21 September 2026. <https://smartdefine.org/imperishable/thesaurus/synonyms> |