93 entries under difficult topic. ×
| slavish(adjective, tough, rough, heavy) | |
| tiring(adjective, tough, severe, rough) | |
| troublesome(adjective, hard, tough, severe, rough) | |
| unsparing(adjective, close, strong, hard, tough) | |
| uphill battle(expression, adjective, tough, rough) | |
| vexatious(adjective, hard, severe, rough) | |
| wearing(adjective, hard, tough, rough) | |
| wearisome(adjective, hard, tough, severe, rough) | |
| wearying(adjective, tough, rough, heavy) | |
| grueling(adjective, severe, harsh, heavy) | |
| herculean(adjective, tough, rough, heavy) | |
| problematical(adjective, awkward, demanding, grueling) | |
| testing(adjective, awkward, demanding, grueling) |
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| APA | Smart Define. (2016). serious thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/serious/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "serious thesaurus" https://smartdefine.org/serious/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2016, serious thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/serious/thesaurus/synonyms>. |
| MLA | Smart Define. "serious thesaurus" 24 February 2016. Web. 23 September 2026. <https://smartdefine.org/serious/thesaurus/synonyms> |