- Definitions|2
- Thesaurus|561
- Abbreviations|0
| icy(adjective, severe) | |
| illiberal | |
| imperial(adjective, severe) | |
| incessant(adjective, persistent, constant, pitiless, unyielding) | |
| independent | |
| insubordinate(adjective, tough, firm, unreasonable, grim) | |
| intense(adjective, severe) | |
| intent(adjective, firm, determined, usual, regular) | |
| inveterate(adjective, firm, determined, usual, regular) | |
| iron-fisted(adjective, persistent, constant, pitiless, unyielding) | |
| iron-willed(adjective, determined, resolute, uncompromising, unshakeable) | |
| ironclad(adjective, firm, determined, usual, regular) | |
| keen(adjective, severe) | |
| lean(adjective, severe) | |
| locked in(expression, adjective, determined, usual, regular) | |
| mean(adjective, hard, tough, harsh, unfeeling) | |
| merciless(adjective, firm, determined, resolute, persistent) | |
| meticulous(adjective, severe) | |
| mortified(adjective, strong, hard, tough, severe) | |
| old-maidish |
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| APA | Smart Define. (2015). stiff-necked thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/stiff-necked/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "stiff-necked thesaurus" https://smartdefine.org/stiff-necked/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2015, stiff-necked thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/stiff-necked/thesaurus/synonyms>. |
| MLA | Smart Define. "stiff-necked thesaurus" 13 April 2015. Web. 26 September 2026. <https://smartdefine.org/stiff-necked/thesaurus/synonyms> |