- Definitions|2
- Thesaurus|529
- Abbreviations|0
| wild(adjective, violent, cruel, vicious, fierce) | |
| without mercy(expression, adjective, vicious, fierce) | |
| adamant(adjective, mean, harsh, cruel, vicious) | |
| atrocious | |
| avaricious(adjective, hard, tough, harsh, cruel) | |
| beastly | |
| brute | |
| calloused | |
| closed(adjective, coldhearted) | |
| cold of heart(expression, idiom) | |
| disagreeable(adjective, coldhearted) | |
| extreme | |
| fell(adjective, violent, cruel, vicious, fierce) | |
| flinthearted | |
| forbidding(adjective, hard, tough, harsh, cruel) | |
| frightful(adjective, violent, cruel, vicious, fierce) | |
| gory | |
| gratuitous(adjective, mean, severe, harsh, cruel) | |
| grim(adjective, mean, hard, tough, severe) | |
| hard-bitten(adjective, hard, tough, harsh, cruel) |
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| APA | Smart Define. (2016). unmerciful thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/unmerciful/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "unmerciful thesaurus" https://smartdefine.org/unmerciful/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2016, unmerciful thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/unmerciful/thesaurus/synonyms>. |
| MLA | Smart Define. "unmerciful thesaurus" 31 March 2016. Web. 25 September 2026. <https://smartdefine.org/unmerciful/thesaurus/synonyms> |