- Definitions|0
- Thesaurus|97
- Abbreviations|0
18 entries under tough topic. ×
| bullhead(adjective, mean, hard, harsh) | |
| hard-boiled(adjective, mean, hard, harsh) | |
| hard-hearted(adjective, mean, hard, harsh) | |
| hard-nosed(adjective, mean, hard, harsh) | |
| immovable(adjective, mean, hard, harsh) | |
| implacable(adjective, mean, hard, harsh) | |
| indurate(adjective, mean, hard, harsh) | |
| iron(adjective, mean, hard, harsh) | |
| mean(adjective, hard, harsh, unfeeling) | |
| perverse(adjective, mean, hard, harsh) | |
| relentless(adjective, mean, hard, harsh) | |
| stiff-necked(adjective, mean, hard, harsh) | |
| thick-skinned(adjective, mean, hard, harsh) | |
| uncompassionate(adjective, mean, hard, harsh) | |
| uncooperative(adjective, mean, hard, harsh) | |
| unimpressible(adjective, mean, hard, harsh) | |
| unshakable(adjective, mean, hard, harsh) | |
| unsympathetic(adjective, mean, hard, harsh) |
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| APA | Smart Define. (2011). tough nut to crack thesaurus. Retrieved October 2, 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 2, 2026). |
| Harvard | Smart Define 2011, tough nut to crack thesaurus, Smart Define, viewed 2 October, 2026, <https://smartdefine.org/tough_nut_to_crack/thesaurus/synonyms>. |
| MLA | Smart Define. "tough nut to crack thesaurus" 23 May 2011. Web. 2 October 2026. <https://smartdefine.org/tough_nut_to_crack/thesaurus/synonyms> |