- Definitions|2
- Thesaurus|217
- Abbreviations|0
| unbreakable(adjective, strong, tough) | |
| unceasing(continuous, lasting, permanent, everlasting, perpetual) | |
| undying(adjective, continuous, enduring, lasting, permanent) | |
| unending(absolute, endless, enduring, lasting, immense) | |
| unfading(stable, constant, enduring, lasting, permanent) | |
| unremitting(continuous, lasting, permanent, everlasting, unending) | |
| without end(expression, absolute, endless, lasting, immense) | |
| age-long | |
| anchored(calm, strong, solid, steady, substantial) | |
| ancient | |
| antique | |
| balanced(calm, strong, solid, steady, substantial) | |
| brick-wall(calm, strong, solid, steady, substantial) | |
| calm(strong, solid, steady, substantial, even) | |
| ceaseless | |
| coeternal | |
| continued(continuous, lasting, permanent, everlasting, uninterrupted) | |
| deep-rooted(calm, strong, solid, steady, substantial) | |
| diuturnal | |
| endure |
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| APA | Smart Define. (2016). perdurable thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/perdurable/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "perdurable thesaurus" https://smartdefine.org/perdurable/thesaurus/synonyms (accessed September 21, 2026). |
| Harvard | Smart Define 2016, perdurable thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/perdurable/thesaurus/synonyms>. |
| MLA | Smart Define. "perdurable thesaurus" 3 March 2016. Web. 21 September 2026. <https://smartdefine.org/perdurable/thesaurus/synonyms> |