238 entries under severe topic. ×
| keen | |
| raw | |
| rough(adjective, strong, hard, tough) | |
| short | |
| spare | |
| titanic(tough, painful, problematic, trying) | |
| ungracious(adjective, bleak, stark, austere) | |
| unpermissive(adjective, hard, tough, rough) | |
| acerbic | |
| acrid(adjective, hard, sharp, flat) | |
| acrimonious | |
| ambitious(tough, painful, problematic, trying) | |
| arduous(adjective, hard, tough, rough) | |
| asperous(adjective, hard, sharp, flat) | |
| backbreaker(tough, painful, problematic, trying) | |
| basic | |
| bothersome(tough, painful, problematic, trying) | |
| brisk | |
| bullheaded(adjective, strong, hard, tough) | |
| by the book(expression, adjective, idiom, strong, hard) |
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| APA | Smart Define. (2015). rigid thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/rigid/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "rigid thesaurus" https://smartdefine.org/rigid/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2015, rigid thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/rigid/thesaurus/synonyms>. |
| MLA | Smart Define. "rigid thesaurus" 3 August 2015. Web. 25 September 2026. <https://smartdefine.org/rigid/thesaurus/synonyms> |