65 entries under tough topic. ×
| uphill(adjective, severe, painful, problematic) | |
| difficult(adjective, hard, problematic, trying) | |
| titanic(severe, painful, problematic, trying) | |
| ambitious(severe, painful, problematic, trying) | |
| arduous(adjective, severe, painful, problematic) | |
| backbreaker(severe, painful, problematic, trying) | |
| bothersome(severe, painful, problematic, trying) | |
| burdensome(adjective, severe, painful, problematic) | |
| challenging(severe, painful, problematic, trying) | |
| crucial(severe, painful, problematic, trying) | |
| demanding(adjective, severe, painful, problematic) | |
| difficile(severe, painful, problematic, trying) | |
| easier said than done(expression, severe, painful, problematic) | |
| effortful(severe, painful, problematic, trying) | |
| exacting(severe, painful, problematic, trying) | |
| fastidious(adjective, problematic, trying) | |
| finicky(adjective, problematic, trying) | |
| galling(severe, painful, problematic, trying) | |
| gargantuan(severe, painful, problematic, trying) | |
| hard-won(severe, painful, problematic, trying) |
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| APA | Smart Define. (2015). upstream thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/upstream/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "upstream thesaurus" https://smartdefine.org/upstream/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2015, upstream thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/upstream/thesaurus/synonyms>. |
| MLA | Smart Define. "upstream thesaurus" 10 April 2015. Web. 24 September 2026. <https://smartdefine.org/upstream/thesaurus/synonyms> |