- Definitions|2
- Thesaurus|1.2k
- Abbreviations|0
| long-lasting(adjective, familiar, stable, constant, established) | |
| macrobiotic | |
| old(adjective, familiar, established, traditional, permanent) | |
| persisting(adjective, determined, steady, stable, persistent) | |
| prolonged(adjective, steady, stable, regular, constant) | |
| straight(adjective, moral, continuous, principled, continual) | |
| unchanged(adjective, wild, original, fixed, basic) | |
| undefined(adjective, infinite) | |
| unfathomable(constant, abundant, unrestrained, endless, immense) | |
| untold(constant, absolute, abundant, unrestrained, immense) | |
| aged | |
| connected(adjective, steady, stable, regular, fixed) | |
| customary(usual, regular, normal, established, hardened) | |
| cyclical(adjective, continuous) | |
| deep | |
| deep-rooted(adjective, permanent, long-term, lifelong) | |
| diuturnal | |
| goddamn | |
| goddamned | |
| good |
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| APA | Smart Define. (2016). perpetual thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/perpetual/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "perpetual thesaurus" https://smartdefine.org/perpetual/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2016, perpetual thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/perpetual/thesaurus/synonyms>. |
| MLA | Smart Define. "perpetual thesaurus" 30 March 2016. Web. 26 September 2026. <https://smartdefine.org/perpetual/thesaurus/synonyms> |