151 entries under adjective topic. ×
| firm(characteristic, strain, firmness, labour) | |
| strong(strain, firmness, labour, hardiness) | |
| hard(strain, firmness, labour, hardness) | |
| stable(strain, firmness, labour, hardiness) | |
| sound(calm, strain, restrained, short) | |
| stiff(strain, firmness, labour, hardness) | |
| resistant(strain, resist, firmness, labour) | |
| tight(strain, firmness, labour, hardiness) | |
| immune(strain, resist, firmness, labour) | |
| impregnable(strain, firmness, labour, hardiness) | |
| steadfast(characteristic, strain, firmness, labour) | |
| steady(calm, strain, restrained, firmness) | |
| fast(strain, firmness, labour, hardiness) | |
| resilient(strain, firmness, labour, hardiness) | |
| resist(strain, firmness, labour, hardiness) | |
| rigid(strain, firmness, labour, hardness) | |
| robust(strain, firmness, labour, hardiness) | |
| substantial(strain, firmness, labour, hardiness) | |
| unyielding(strain, firmness, labour, hardness) | |
| impervious(characteristic, calm, resist, restrained) |
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| APA | Smart Define. (2015). proof thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/proof/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "proof thesaurus" https://smartdefine.org/proof/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, proof thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/proof/thesaurus/synonyms>. |
| MLA | Smart Define. "proof thesaurus" 22 December 2015. Web. 22 September 2026. <https://smartdefine.org/proof/thesaurus/synonyms> |