| caustic(adjective, severe) | |
| churlish | |
| difficult(adjective, hard, severe, rough, harsh) | |
| extreme(adjective, convention) | |
| fierce(adjective, mean, hard, severe, rough) | |
| hard-core(adjective, severe, firm, harsh, serious) | |
| hard-hearted(adjective, mean, severe, harsh, cruel) | |
| hard-shell(adjective, severe, serious, persistent, unsympathetic) | |
| hidebound(adjective, severe, persistent, obstinate, insistent) | |
| inhuman(adjective, mean, harsh, cruel, vicious) | |
| intolerant(adjective, severe, plain, straightforward) | |
| meticulous(adjective, severe) | |
| mordant | |
| persistent(adjective, resolute, obstinate, insistent, dogged) | |
| quarter | |
| resolved(adjective, resolute, persistent, rigid, obstinate) | |
| rump | |
| tushy(noun, ass, behind, buns, arse) | |
| unapologetic | |
| unflinching(adjective, resolute, persistent, obstinate, insistent) |
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| APA | Smart Define. (2016). stern thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/stern/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "stern thesaurus" https://smartdefine.org/stern/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2016, stern thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/stern/thesaurus/synonyms>. |
| MLA | Smart Define. "stern thesaurus" 24 March 2016. Web. 23 September 2026. <https://smartdefine.org/stern/thesaurus/synonyms> |