- Definitions|2
- Thesaurus|716
- Abbreviations|0
135 entries under adjective topic. ×
| strong(sound, reasonable, strain, rational) | |
| firm(strain, true, firmness, constant) | |
| hard(strain, firmness, labour, hardiness) | |
| sound(reasonable, strain, firm, true) | |
| stable(strain, firm, true, firmness) | |
| stiff(strain, firmness, labour, hardiness) | |
| fast(strain, firm, firmness, constant) | |
| tenable(strain, firmness, labour, safety) | |
| unyielding(strain, firmness, labour, hardiness) | |
| proof(strain, firmness, labour, hardiness) | |
| resistant(strain, firmness, labour, hardiness) | |
| steadfast(strain, firmness, labour, hardiness) | |
| rigid(strain, firmness, labour, hardiness) | |
| robust(strain, firmness, labour, hardiness) | |
| substantial(strain, firmness, labour, hardiness) | |
| tight(strain, firm, true, firmness) | |
| constant(strain, firmness, labour, hardiness) | |
| durable(strain, firmness, labour, hardiness) | |
| immune(strain, firmness, safe, labour) | |
| lasting(strain, firmness, labour, hardiness) |
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| APA | Smart Define. (2015). impregnable thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/impregnable/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "impregnable thesaurus" https://smartdefine.org/impregnable/thesaurus/synonyms (accessed September 21, 2026). |
| Harvard | Smart Define 2015, impregnable thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/impregnable/thesaurus/synonyms>. |
| MLA | Smart Define. "impregnable thesaurus" 10 April 2015. Web. 21 September 2026. <https://smartdefine.org/impregnable/thesaurus/synonyms> |