- Definitions|2
- Thesaurus|431
- Abbreviations|0
23 entries under hardened topic. ×
| perennial(adjective, familiar, established, enduring) | |
| enduring(adjective, familiar, fixed, established) | |
| chronic(adjective, fixed, persistent, lasting) | |
| old(adjective, familiar, established, traditional) | |
| permanent(adjective, lasting, confirmed, perpetual) | |
| long-lived(adjective, familiar, persistent, established) | |
| persistent(adjective, continuous, lasting, continuing) | |
| long-lasting(adjective, familiar, established, lasting) | |
| abiding(adjective, fixed, persistent, lasting) | |
| fixed(verb, persistent, continuous, lasting) | |
| long-standing(adjective, persistent, continuous, lasting) | |
| settled(verb, persistent, continuous, lasting) | |
| confirmed(verb, fixed, persistent, continuous) | |
| deep-rooted(adjective, fixed, persistent, lasting) | |
| deep-seated(fixed, persistent, continuous, lasting) | |
| habitual(fixed, persistent, continuous, lasting) | |
| inbred(fixed, persistent, continuous, lasting) | |
| incurable(fixed, persistent, continuous, lasting) | |
| ineradicable(fixed, persistent, continuous, lasting) | |
| ingrained(fixed, persistent, continuous, lasting) |
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| APA | Smart Define. (2015). lifelong thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/lifelong/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "lifelong thesaurus" https://smartdefine.org/lifelong/thesaurus/synonyms (accessed September 29, 2026). |
| Harvard | Smart Define 2015, lifelong thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/lifelong/thesaurus/synonyms>. |
| MLA | Smart Define. "lifelong thesaurus" 14 April 2015. Web. 29 September 2026. <https://smartdefine.org/lifelong/thesaurus/synonyms> |