- Definitions|0
- Thesaurus|626
- Abbreviations|0
141 entries under tough topic. ×
| tenacious(adjective, strong, hard, sound) | |
| thick-skinned(adjective, calm, hard, cool) | |
| unbending(adjective, strong, hard, fixed) | |
| uncompromising(adjective, firm, fixed, distant) | |
| unfeeling(adjective, hard, rough, harsh) | |
| unflexible(adjective, firm, stiff, distant) | |
| unkind(adjective, hard, harsh, indifferent) | |
| unrelenting(adjective, firm, harsh, cruel) | |
| unswayable(adjective, firm, fixed, distant) | |
| unyielding(adjective, strong, hard, sound) | |
| uptight(adjective, firm, fixed, distant) | |
| well-built(adjective, strong, sound, solid) | |
| well-founded(adjective, strong, sound, solid) | |
| well-made(adjective, strong, sound, solid) | |
| acrimonious(adjective, severe, harsh, cruel) | |
| adamant(adjective, strong, hard, fixed) | |
| adamantine(adjective, set, strong, hard) | |
| antagonistic(adjective, severe, harsh, cruel) | |
| austere(adjective, harsh, cruel, grim) | |
| bitter(adjective, harsh, cruel, grim) |
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| APA | Smart Define. (2015). hard as nails thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/hard_as_nails/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "hard as nails thesaurus" https://smartdefine.org/hard_as_nails/thesaurus/synonyms (accessed September 30, 2026). |
| Harvard | Smart Define 2015, hard as nails thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/hard_as_nails/thesaurus/synonyms>. |
| MLA | Smart Define. "hard as nails thesaurus" 10 April 2015. Web. 30 September 2026. <https://smartdefine.org/hard_as_nails/thesaurus/synonyms> |