191 entries under tough topic. ×
| crucial(severe, painful, problematic, trying) | |
| difficile(severe, painful, problematic, trying) | |
| disciplinary(adjective, strong, hard, severe) | |
| dyed-in-the-wool(adjective, set, strong, hard) | |
| easier said than done(expression, severe, painful, problematic) | |
| effortful(severe, painful, problematic, trying) | |
| forbidding(adjective, strong, hard, severe) | |
| frowning(adjective, strong, hard, severe) | |
| galling(severe, painful, problematic, trying) | |
| gargantuan(severe, painful, problematic, trying) | |
| hang-tough(adjective, strong, hard, harsh) | |
| hard-won(severe, painful, problematic, trying) | |
| hard as nails(expression, adjective, idiom, set, strong) | |
| heavy(adjective, strong, hard, severe) | |
| herculean(severe, painful, problematic, trying) | |
| immense(severe, painful, problematic, trying) | |
| intricate(adjective, severe, painful, demanding) | |
| iron-fisted(adjective, severe, firm, harsh) | |
| irritating(severe, painful, problematic, trying) | |
| jelled(adjective, hard, firm, solid) |
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| APA | Smart Define. (2015). rigid thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/rigid/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "rigid thesaurus" https://smartdefine.org/rigid/thesaurus/synonyms (accessed September 28, 2026). |
| Harvard | Smart Define 2015, rigid thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/rigid/thesaurus/synonyms>. |
| MLA | Smart Define. "rigid thesaurus" 3 August 2015. Web. 28 September 2026. <https://smartdefine.org/rigid/thesaurus/synonyms> |