| cat-hearted(adjective, person, unwarmhearted) | |
| disciplined(adjective, severe) | |
| fiendish(adjective, person, unwarmhearted) | |
| fundament | |
| gloomy | |
| half-spirited(adjective, person, unwarmhearted) | |
| hard-boiled(adjective, hard, tough, severe, rough) | |
| hard-line(adjective, hard, tough, severe, rough) | |
| hateful(adjective, person, unwarmhearted) | |
| headstrong(adjective, hard, tough, rough, harsh) | |
| immovable(adjective, determined, resolute, rigid, uncompromising) | |
| inclement(adjective, hard, tough, severe, rough) | |
| indecent(adjective, person, unwarmhearted) | |
| inhumane(adjective, person, unwarmhearted) | |
| intractable(adjective, appearance, terrible, persistent, obstinate) | |
| iron(adjective, persistent, obstinate, insistent, dogged) | |
| keen(adjective, severe) | |
| mummified(adjective, person, unwarmhearted) | |
| nates | |
| pitiless(adjective, mean, hard, severe, sharp) |
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| APA | Smart Define. (2016). stern thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/stern/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "stern thesaurus" https://smartdefine.org/stern/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2016, stern thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/stern/thesaurus/synonyms>. |
| MLA | Smart Define. "stern thesaurus" 24 March 2016. Web. 22 September 2026. <https://smartdefine.org/stern/thesaurus/synonyms> |