93 entries under difficult topic. ×
| involved(adjective, hard, complex, awkward) | |
| massive(adjective, hard, complex) | |
| oppressive(adjective, hard, complex) | |
| sore(adjective, hard, complex) | |
| stubborn(adjective, strong, hard, tough, firm) | |
| troubled(adjective, hard, unhappy, gloomy) | |
| backbreaking(adjective, hard, complex, awkward) | |
| burdensome(adjective, hard, big, heavy) | |
| complicated(adjective, hard, complex, awkward) | |
| cruel(adjective, strong, hard, tough, severe) | |
| disturbing(adjective, hard, complex) | |
| esoteric(adjective, hard, complex) | |
| grinding(adjective, hard, harsh, cruel) | |
| hard-nosed(adjective, strong, hard, tough, severe) | |
| heavy(adjective, strong, hard, great, tough) | |
| intricate(adjective, hard, complex, awkward) | |
| knotty(adjective, hard, complex, awkward) | |
| ponderous(adjective, hard, complex) | |
| rough(adjective, bad, strong, hard, tough) | |
| rugged(adjective, strong, hard, tough) |
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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> |