- Definitions|0
- Thesaurus|28
- Abbreviations|1
26 entries under adjective topic. ×
| adamant(strong, hard, tough) | |
| adamantine(strong, hard, tough) | |
| dense(strong, hard, tough) | |
| determined(strong, hard, tough) | |
| ferric(strong, hard, tough) | |
| ferrous(strong, hard, tough) | |
| firm(strong, hard, tough) | |
| hard(strong, tough) | |
| hard as nails(expression, idiom, strong, hard) | |
| heavy(strong, hard, tough) | |
| immovable(strong, hard, tough) | |
| implacable(strong, hard, tough) | |
| indomitable(strong, hard, tough) | |
| inexorable(strong, hard, tough) | |
| insensible(strong, hard, tough) | |
| obdurate(strong, hard, tough) | |
| relentless(strong, hard, tough) | |
| rigid(strong, hard, tough) | |
| robust(strong, hard, tough) | |
| steel(strong, hard, tough) |
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| APA | Smart Define. (-0001). rock hard thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/rock_hard/thesaurus/synonyms |
| Chicago | Smart Define. -0001. "rock hard thesaurus" https://smartdefine.org/rock_hard/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define -0001, rock hard thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/rock_hard/thesaurus/synonyms>. |
| MLA | Smart Define. "rock hard thesaurus" 30 November -0001. Web. 26 September 2026. <https://smartdefine.org/rock_hard/thesaurus/synonyms> |