- Definitions|0
- Thesaurus|626
- Abbreviations|0
307 entries under adjective topic. ×
| imperturbable(calm, cool, collected, unflappable) | |
| in fine feather(expression, idiom, strong, sound) | |
| incompliant(tough, firm, fixed, distant) | |
| incurious(hard, indifferent, unkind, unresponsive) | |
| indurated(set, strong, hard, unfeeling) | |
| inelastic(tough, firm, fixed, distant) | |
| inexorable(strong, hard, tough, firm) | |
| inflexible(set, strong, hard, tough) | |
| insensitive(hard, tough, indifferent, cruel) | |
| insusceptible(hard, insensitive, unsusceptible) | |
| intractable(tough, firm, fixed, distant) | |
| locked in(expression, tough, firm, distant) | |
| muscular(strong, sound, tough, solid) | |
| nerveless(calm, cool, steady, tranquil) | |
| nonchalant(calm, cool, steady, unaffected) | |
| obtuse(hard, indifferent, unfeeling, unkind) | |
| pitiless(cruel, vicious, fixed, unfeeling) | |
| reinforced(strong, sound, tough, solid) | |
| relentless(strong, hard, tough, firm) | |
| reserved(tough, firm, fixed, distant) |
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| APA | Smart Define. (2015). hard as nails thesaurus. Retrieved September 28, 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 28, 2026). |
| Harvard | Smart Define 2015, hard as nails thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/hard_as_nails/thesaurus/synonyms>. |
| MLA | Smart Define. "hard as nails thesaurus" 10 April 2015. Web. 28 September 2026. <https://smartdefine.org/hard_as_nails/thesaurus/synonyms> |