- Definitions|0
- Thesaurus|626
- Abbreviations|0
141 entries under tough topic. ×
| fixed(adjective, strong, sound, solid) | |
| formal(adjective, firm, fixed, distant) | |
| hard-boiled(adjective, hard, harsh, indifferent) | |
| hard-line(adjective, firm, fixed, rigid) | |
| hardboiled(adjective, determined, serious, stiff) | |
| hardened(adjective, set, strong, hard) | |
| heavy(adjective, strong, hard, sound) | |
| heavy-duty(adjective, strong, sound, solid) | |
| hold the fort(expression, adjective, idiom, firm) | |
| hold the line(expression, adjective, idiom, firm) | |
| immovable(adjective, calm, strong, hard, cool) | |
| in fine feather(expression, adjective, idiom, strong, sound) | |
| incompliant(adjective, firm, fixed, distant) | |
| inelastic(adjective, firm, fixed, distant) | |
| inexorable(adjective, strong, hard, firm) | |
| inflexible(adjective, set, strong, hard) | |
| insensitive(adjective, hard, indifferent, cruel) | |
| intractable(adjective, firm, fixed, distant) | |
| locked in(expression, adjective, firm, distant) | |
| muscular(adjective, strong, sound, solid) |
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| APA | Smart Define. (2015). hard as nails thesaurus. Retrieved September 30, 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 30, 2026). |
| Harvard | Smart Define 2015, hard as nails thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/hard_as_nails/thesaurus/synonyms>. |
| MLA | Smart Define. "hard as nails thesaurus" 10 April 2015. Web. 30 September 2026. <https://smartdefine.org/hard_as_nails/thesaurus/synonyms> |