93 entries under difficult topic. ×
| sensitive(adjective, hard, complex) | |
| sophisticated(adjective, hard, complex) | |
| sticky(adjective, hard, complex, awkward) | |
| toilful(adjective, hard, complex, awkward) | |
| toilsome(adjective, hard, harsh, cruel) | |
| hefty(adjective, hard, complex) | |
| messy(adjective, hard, unpleasant, complex) | |
| taxing(adjective, hard, complex) | |
| tricky(adjective, hard, complex, awkward) | |
| trying(adjective, hard, complex) | |
| unbearable(adjective, hard, complex) | |
| pressing(adjective, hard, tough, big) | |
| urgent(adjective, hard, tough, severe) | |
| terrible(adjective, bad, great, extraordinary) | |
| challenging(adjective, hard, tough, importance) | |
| formidable(adjective, bad, hard, unpleasant) | |
| distressing(adjective, tough, severe, rough) | |
| strenuous(adjective, hard, severe, rough) | |
| violent(adjective, hard, severe, rough) | |
| awkward(adjective, demanding, grueling, problematical) |
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| APA | Smart Define. (2016). serious thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/serious/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "serious thesaurus" https://smartdefine.org/serious/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2016, serious thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/serious/thesaurus/synonyms>. |
| MLA | Smart Define. "serious thesaurus" 24 February 2016. Web. 22 September 2026. <https://smartdefine.org/serious/thesaurus/synonyms> |