116 entries under tough topic. ×
| hardened(adjective, hard, firm, solid) | |
| solidified(adjective, set, hard, firm) | |
| tiring(adjective, demanding, problematic, trying) | |
| toilsome(adjective, severe, difficult, painful) | |
| viscous(adjective, heavy, thick, dense) | |
| challenging(severe, painful, demanding, problematic) | |
| grim(adjective, severe, harsh, cruel) | |
| painful(adjective, severe, rough, difficult) | |
| ropy(thin, heavy, thick, dense) | |
| viscid(adjective, informal, heavy, thick) | |
| close(adjective, set, hard, severe) | |
| concentrated(adjective, set, strong, hard) | |
| concrete(adjective, set, hard, solid) | |
| condensed(adjective, set, hard, solid) | |
| fussy(adjective, particular, problematic, trying) | |
| glutinous(adjective, thick, syrupy, tacky) | |
| impervious(adjective, set, hard, solid) | |
| jelled(adjective, set, hard, firm) | |
| perverse(adjective, problematic, trying) | |
| prohibitive(adjective, extraordinary, extreme, grim) |
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| APA | Smart Define. (2015). stiff thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/stiff/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "stiff thesaurus" https://smartdefine.org/stiff/thesaurus/synonyms (accessed September 28, 2026). |
| Harvard | Smart Define 2015, stiff thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/stiff/thesaurus/synonyms>. |
| MLA | Smart Define. "stiff thesaurus" 24 December 2015. Web. 28 September 2026. <https://smartdefine.org/stiff/thesaurus/synonyms> |