| untiring(adjective, determined, persevering) | |
| unvaried | |
| unwavering(adjective, strong, firm, determined, steady) | |
| unwearied(adjective, strong, firm, determined, steady) | |
| usual(adjective, persistent, continuous, hardened, lasting) | |
| vital(active, alive, operative, existing, breathing) | |
| absolute | |
| accelerating(adjective, tolerant, modern, radical, dynamic) | |
| active(adjective, alive, operative, existing, functioning) | |
| addendum(noun, increase, delay, development, spread) | |
| addition(noun, increase, delay, development, spread) | |
| adjunct(noun, increase, delay, development, spread) | |
| advanced(adjective, tolerant, modern, radical, dynamic) | |
| affecting | |
| age-long | |
| amplification(noun, increase, delay, development, spread) | |
| ancient | |
| annex(noun, increase, delay, development, spread) | |
| antique | |
| appeasing |
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| APA | Smart Define. (2016). continuing thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/continuing/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "continuing thesaurus" https://smartdefine.org/continuing/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2016, continuing thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/continuing/thesaurus/synonyms>. |
| MLA | Smart Define. "continuing thesaurus" 26 February 2016. Web. 22 September 2026. <https://smartdefine.org/continuing/thesaurus/synonyms> |