- Definitions|0
- Thesaurus|626
- Abbreviations|0
107 entries under strong topic. ×
| energetic(adjective, sound, tough, solid) | |
| firm(adjective, set, hard, sound) | |
| fixed(adjective, sound, tough, solid) | |
| hard-handed(adjective, set, hard, continue) | |
| hardened(adjective, set, hard, tough) | |
| healthy(adjective, hard, solid, heavy) | |
| heavy(adjective, hard, sound, tough) | |
| heavy-duty(adjective, sound, tough, solid) | |
| immovable(adjective, calm, hard, cool) | |
| impenetrable(adjective, set, hard, firm) | |
| in fine feather(expression, adjective, idiom, sound) | |
| indurated(adjective, set, hard, unfeeling) | |
| inexorable(adjective, hard, tough, firm) | |
| inflexible(adjective, set, hard, tough) | |
| muscular(adjective, sound, tough, solid) | |
| reinforced(adjective, sound, tough, solid) | |
| relentless(adjective, hard, tough, firm) | |
| rigid(adjective, set, hard, tough) | |
| seasoned(adjective, hard, solid, stiff) | |
| secure(adjective, 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> |