- Definitions|0
- Thesaurus|113
- Abbreviations|1
| strong(adjective, strain, firmness, distinct, labour) | |
| sound(adjective, strain, firmness, labour, hardiness) | |
| hard(adjective, strain, firmness, labour, hardiness) | |
| substantial(adjective, strain, firmness, labour, hardiness) | |
| lasting(adjective, strain, firmness, labour, hardiness) | |
| long-standing(adjective, strain, firmness, labour, hardiness) | |
| settled(adjective, strain, firmness, labour, hardiness) | |
| enduring(adjective, strain, firmness, labour, hardiness) | |
| set | |
| dyed-in-the-wool | |
| good(true, real, indisputable) | |
| well-founded | |
| absolute(complete, true, fixed, real, indisputable) | |
| actual(true, real, indisputable) | |
| age-old(adjective, old) | |
| ageless | |
| classic | |
| confirmed | |
| deep-dyed | |
| deep-rooted |
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| APA | Smart Define. (2015). well-established thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/well-established/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "well-established thesaurus" https://smartdefine.org/well-established/thesaurus/synonyms (accessed September 20, 2026). |
| Harvard | Smart Define 2015, well-established thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/well-established/thesaurus/synonyms>. |
| MLA | Smart Define. "well-established thesaurus" 13 April 2015. Web. 20 September 2026. <https://smartdefine.org/well-established/thesaurus/synonyms> |