- Definitions|0
- Thesaurus|626
- Abbreviations|0
47 entries under substantial topic. ×
| staunch(adjective, strong, sound, tough, solid) | |
| steady(adjective, calm, strong, cool, sound) | |
| tenacious(adjective, strong, hard, sound, tough) | |
| unyielding(adjective, strong, hard, sound, tough) | |
| well-built(adjective, strong, sound, tough, solid) | |
| well-founded(adjective, strong, sound, tough, solid) | |
| well-made(adjective, strong, sound, tough, solid) |
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| APA | Smart Define. (2015). hard as nails thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/hard_as_nails/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "hard as nails thesaurus" https://smartdefine.org/hard_as_nails/thesaurus/synonyms (accessed September 29, 2026). |
| Harvard | Smart Define 2015, hard as nails thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/hard_as_nails/thesaurus/synonyms>. |
| MLA | Smart Define. "hard as nails thesaurus" 10 April 2015. Web. 29 September 2026. <https://smartdefine.org/hard_as_nails/thesaurus/synonyms> |