- Definitions|2
- Thesaurus|675
- Abbreviations|0
150 entries under adjective topic. ×
| hard-line(strong, hard, tough, severe) | |
| indomitable(set, strong, hard, tough) | |
| insensible(strong, hard, tough, sturdy) | |
| iron-willed(determined, resolute, uncompromising, unshakeable) | |
| potent | |
| puissant | |
| rock-ribbed(determined, resolute, uncompromising, unshakeable) | |
| stony-hearted | |
| stringent(hard, severe, stiff, resolute) | |
| strong-willed(determined, resolute, uncompromising, unshakeable) | |
| stubborn as a mule(idiom, resist, firmly) | |
| thick(strong, hard, tough, firm) | |
| unsparing(strong, hard, tough, sturdy) | |
| unswerving(determined, resolute, uncompromising, unshakeable) | |
| unsympathetic | |
| armored(strong, tough, permanent, strengthened) | |
| astringent(strong, hard, tough, sturdy) | |
| bad | |
| bitter(strong, hard, tough, sturdy) | |
| by the book(expression, idiom, strong, hard) |
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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> |