| unchanging | |
| vintage(adjective, antique, old-time, oldfangled, old-school) | |
| immutable(adjective, lasting, permanent, everlasting, unending) | |
| unfading(vast, lasting, permanent, everlasting, eternal) | |
| eterne(adjective, change, archaism) | |
| evergreen(adjective, endless, everlasting, eternal, perpetual) | |
| forever(adjective, vast, lasting, permanent, everlasting) | |
| good | |
| indefinite(adjective, lasting, permanent, everlasting, eternal) | |
| loving | |
| nonstop(adjective, continue) | |
| ongoing(adjective, continue) | |
| round-the-clock(adjective, continue, continual) | |
| traditional | |
| unbounded(adjective, infinite) | |
| unfailing(adjective, continue) | |
| uninterrupted(adjective, continue, steady, regular, constant) | |
| venerable | |
| without end(expression, adjective, vast, lasting, permanent) | |
| immeasurable(adjective, endless, infinite, boundless, incessant) |
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| APA | Smart Define. (2016). timeless thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/timeless/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "timeless thesaurus" https://smartdefine.org/timeless/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2016, timeless thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/timeless/thesaurus/synonyms>. |
| MLA | Smart Define. "timeless thesaurus" 29 March 2016. Web. 22 September 2026. <https://smartdefine.org/timeless/thesaurus/synonyms> |