- Definitions|2
- Thesaurus|2k
- Abbreviations|0
| haunting | |
| immutable(adjective, set, hard, stiff, persistent) | |
| importunate | |
| inalterable(adjective, inflexible) | |
| indifferent(adjective, rocky, pebbly, flinty) | |
| indomitable(adjective, set, strong, hard, tough) | |
| industrious | |
| inhumane(adjective, animal, mean, hard, tough) | |
| insensitive(adjective, hard, tough, harsh, cruel) | |
| interminable(adjective, determined, steady, resolute, persistent) | |
| invariable(adjective, severe, harsh, solid, certain) | |
| ironclad | |
| long | |
| loyal | |
| macabre | |
| malevolent(adjective, mean, evil, nasty, harsh) | |
| mean(adjective, animal, hard, severe, nasty) | |
| mordant | |
| nagging | |
| never-ending(determined, constant, obstinate, continuous, endless) |
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| APA | Smart Define. (2015). unrelenting thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/unrelenting/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "unrelenting thesaurus" https://smartdefine.org/unrelenting/thesaurus/synonyms (accessed September 27, 2026). |
| Harvard | Smart Define 2015, unrelenting thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/unrelenting/thesaurus/synonyms>. |
| MLA | Smart Define. "unrelenting thesaurus" 3 August 2015. Web. 27 September 2026. <https://smartdefine.org/unrelenting/thesaurus/synonyms> |