- Definitions|1
- Thesaurus|308
- Abbreviations|0
| persistent | |
| rancorous(adjective, mean, harsh, cruel, vicious) | |
| rigid(adjective, harsh, cruel, determined, fierce) | |
| severe(adjective, mean, harsh, cruel, vicious) | |
| unmitigable | |
| unsatisfied(adjective, avid, greedy, wanting, rapacious) | |
| vindictive(adjective, mean, harsh, cruel, determined) | |
| revengeful(adjective, mean, harsh, cruel, vicious) | |
| acquisitive | |
| all-devouring | |
| avaricious | |
| avenging | |
| barbarous(adjective, mean, severe, harsh, cruel) | |
| bottomless | |
| bound(adjective, harsh, cruel, determined, fierce) | |
| bound and determined(expression, adjective, idiom, harsh, cruel) | |
| brutal(adjective, mean, harsh, cruel, vicious) | |
| bullheaded(adjective, determined, resolute, uncompromising, unshakeable) | |
| callous(adjective, mean, severe, harsh, cruel) | |
| compassionless(adjective, mean, severe, harsh, cruel) |
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| APA | Smart Define. (2015). unappeasable thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/unappeasable/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "unappeasable thesaurus" https://smartdefine.org/unappeasable/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2015, unappeasable thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/unappeasable/thesaurus/synonyms>. |
| MLA | Smart Define. "unappeasable thesaurus" 14 April 2015. Web. 25 September 2026. <https://smartdefine.org/unappeasable/thesaurus/synonyms> |