- Definitions|0
- Thesaurus|97
- Abbreviations|0
37 entries under mean topic. ×
| adamant(adjective, hard, severe, harsh) | |
| bullhead(adjective, hard, tough, harsh) | |
| cold fish(expression, adjective, hard, unfeeling) | |
| dogged(adjective, hard, harsh, inflexible) | |
| firm(adjective, hard, severe, harsh) | |
| fixed(adjective, hard, severe, harsh) | |
| hanging tough(expression, adjective, hard, rigid) | |
| hard(adjective, severe, harsh, solid) | |
| hard-boiled(adjective, hard, tough, harsh) | |
| hard-hearted(adjective, hard, tough, harsh) | |
| hard-nosed(adjective, hard, tough, harsh) | |
| harsh(adjective, hard, severe, solid) | |
| immovable(adjective, hard, tough, harsh) | |
| implacable(adjective, hard, tough, harsh) | |
| indurate(adjective, hard, tough, harsh) | |
| inexorable(adjective, hard, harsh, stiff) | |
| inflexible(adjective, hard, severe, harsh) | |
| iron(adjective, hard, tough, harsh) | |
| mulish(adjective, hard, harsh, inflexible) | |
| obstinate(adjective, hard, harsh, inflexible) |
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| APA | Smart Define. (2011). tough nut to crack thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/tough_nut_to_crack/thesaurus/synonyms |
| Chicago | Smart Define. 2011. "tough nut to crack thesaurus" https://smartdefine.org/tough_nut_to_crack/thesaurus/synonyms (accessed October 1, 2026). |
| Harvard | Smart Define 2011, tough nut to crack thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/tough_nut_to_crack/thesaurus/synonyms>. |
| MLA | Smart Define. "tough nut to crack thesaurus" 23 May 2011. Web. 1 October 2026. <https://smartdefine.org/tough_nut_to_crack/thesaurus/synonyms> |