- Definitions|2
- Thesaurus|675
- Abbreviations|0
150 entries under adjective topic. ×
| cast-iron(firm, solid) | |
| compact(set, strong, hard, firm) | |
| compacted(set, strong, hard, firm) | |
| compressed(set, strong, hard, firm) | |
| concentrated(set, strong, hard, firm) | |
| consolidated(set, strong, hard, firm) | |
| critical | |
| diamantine | |
| diamondlike(diamond, resembling) | |
| disciplinary(strong, hard, tough, sturdy) | |
| ferric(strong, hard, tough, sturdy) | |
| ferrous(strong, hard, tough, sturdy) | |
| forbidding(strong, hard, tough, sturdy) | |
| frowning(strong, hard, tough, sturdy) | |
| hang-tough(strong, hard, tough, sturdy) | |
| hard-bitten | |
| hard-handed(set, strong, hard, compact) | |
| hard-shell(strong, hard, tough, sturdy) | |
| hard as nails(expression, idiom, set, strong) | |
| harder |
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| APA | Smart Define. (2015). adamantine thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/adamantine/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "adamantine thesaurus" https://smartdefine.org/adamantine/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2015, adamantine thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/adamantine/thesaurus/synonyms>. |
| MLA | Smart Define. "adamantine thesaurus" 10 April 2015. Web. 26 September 2026. <https://smartdefine.org/adamantine/thesaurus/synonyms> |