- Definitions|0
- Thesaurus|626
- Abbreviations|0
307 entries under adjective topic. ×
| feelingless(hard, indifferent, unfeeling, unkind) | |
| firm(set, strong, hard, sound) | |
| fixed(strong, sound, tough, solid) | |
| formal(tough, firm, fixed, distant) | |
| hard-as-nails(determined, serious, persistent, callous) | |
| hard-boiled(hard, tough, harsh, indifferent) | |
| hard-handed(set, strong, hard, continue) | |
| hard-line(tough, firm, fixed, rigid) | |
| hardboiled(tough, determined, serious, stiff) | |
| hardened(set, strong, hard, tough) | |
| hardhearted(hard, indifferent, unfeeling, unkind) | |
| healthy(strong, hard, solid, heavy) | |
| heartless(feeling, hard, cold, indifferent) | |
| heavy(strong, hard, sound, tough) | |
| heavy-duty(strong, sound, tough, solid) | |
| hold the fort(expression, idiom, tough, firm) | |
| hold the line(expression, idiom, tough, firm) | |
| immovable(calm, strong, hard, cool) | |
| impenetrable(set, strong, hard, firm) | |
| imperceptive(hard, indifferent, unkind, unresponsive) |
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| APA | Smart Define. (2015). hard as nails thesaurus. Retrieved September 29, 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 29, 2026). |
| Harvard | Smart Define 2015, hard as nails thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/hard_as_nails/thesaurus/synonyms>. |
| MLA | Smart Define. "hard as nails thesaurus" 10 April 2015. Web. 29 September 2026. <https://smartdefine.org/hard_as_nails/thesaurus/synonyms> |