| unabating(adjective, persistent, continuous, lasting, continuing) | |
| unending(adjective, persistent, constant, current, continuous) | |
| universal(adjective, usual, regular, normal, accepted) | |
| unrelenting(adjective, persistent, constant, continuous, endless) | |
| unremitting(adjective, resolute, persistent, constant, living) | |
| wonted(common, natural, usual, regular, normal) | |
| addicted | |
| addictive | |
| admittedly | |
| age-long | |
| ancient | |
| antique | |
| assuredly | |
| built-in | |
| canonical(adjective, regular) | |
| certainly | |
| chronically | |
| chronics | |
| congenital | |
| continue |
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| APA | Smart Define. (2016). chronic thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/chronic/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "chronic thesaurus" https://smartdefine.org/chronic/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2016, chronic thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/chronic/thesaurus/synonyms>. |
| MLA | Smart Define. "chronic thesaurus" 26 February 2016. Web. 23 September 2026. <https://smartdefine.org/chronic/thesaurus/synonyms> |