- Definitions|1
- Thesaurus|219
- Abbreviations|0
21 entries under threatening topic. ×
| inflexible(adjective, strong, hard, tough, severe) | |
| stern(adjective, hard, tough, severe, rough) | |
| unyielding(adjective, strong, hard, tough, severe) | |
| strict(adjective, strong, hard, tough, severe) | |
| tough(adjective, strong, hard, rough, firm) | |
| adamant(adjective, strong, hard, tough, rough) | |
| firm(adjective, strong, hard, tough, severe) | |
| hard-shelled(adjective, hard, tough, severe, rough) | |
| severe(adjective, strong, hard, tough, rough) | |
| hard-boiled(adjective, strong, hard, tough, severe) | |
| hard-nosed(adjective, strong, hard, tough, severe) | |
| obdurate(adjective, strong, hard, tough, severe) | |
| obstinate(adjective, hard, tough, rough, firm) | |
| stubborn(adjective, strong, hard, tough, rough) | |
| unbending(adjective, strong, hard, tough, rough) | |
| callous(adjective, hard, tough, severe, rough) | |
| cruel(adjective, strong, hard, tough, severe) | |
| hard(adjective, strong, tough, severe, rough) | |
| harsh(adjective, strong, hard, tough, severe) | |
| headstrong(adjective, hard, tough, severe, rough) |
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| APA | Smart Define. (2015). hard-line thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/hard-line/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "hard-line thesaurus" https://smartdefine.org/hard-line/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2015, hard-line thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/hard-line/thesaurus/synonyms>. |
| MLA | Smart Define. "hard-line thesaurus" 14 April 2015. Web. 26 September 2026. <https://smartdefine.org/hard-line/thesaurus/synonyms> |