- Definitions|2
- Thesaurus|815
- Abbreviations|0
| timeless(adjective, change, steady, constant, lasting) | |
| endless(adjective, ageless) | |
| eternal(adjective, change, pause, endless, ageless) | |
| everlasting(adjective, ageless) | |
| permanent(adjective, steady, constant, continuous, lasting) | |
| ceaseless | |
| perpetual | |
| sempiternal(adjective, eternal) | |
| unending | |
| ageless(adjective, change, enduring, lasting, permanent) | |
| immemorial(adjective, lasting, permanent, everlasting, unending) | |
| immortal(adjective, ageless) | |
| enduring | |
| interminable | |
| lasting(adjective, permanent, everlasting, unending, undying) | |
| undated | |
| continual(adjective, constant, incessant) | |
| age-old | |
| ancient | |
| antique |
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| APA | Smart Define. (2016). dateless thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/dateless/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "dateless thesaurus" https://smartdefine.org/dateless/thesaurus/synonyms (accessed September 21, 2026). |
| Harvard | Smart Define 2016, dateless thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/dateless/thesaurus/synonyms>. |
| MLA | Smart Define. "dateless thesaurus" 26 February 2016. Web. 21 September 2026. <https://smartdefine.org/dateless/thesaurus/synonyms> |