- Definitions|2
- Thesaurus|2.1k
- Abbreviations|0
92 entries under hard topic. ×
| knotted(adjective, difficult, complex) | |
| labyrinthine(adjective, difficult, complex, intricate) | |
| leaden(adjective, difficult, complex) | |
| ponderous(adjective, difficult, complex) | |
| problematic(adjective, tough, difficult, complex) | |
| profound(adjective, difficult, complex) | |
| sophisticated(adjective, difficult, complex, intricate) | |
| sticky(adjective, difficult, complex, awkward) | |
| toilful(adjective, difficult, complex, awkward) | |
| grueling(adjective, tough, severe, difficult) | |
| troublesome(adjective, tough, difficulty, difficult) | |
| uphill(adjective, great, tough, easy) | |
| demanding(adjective, dull, tough, severe) | |
| exacting(adjective, dull, tough, severe) | |
| rigorous(adjective, tough, severe, rough) | |
| stiff(adjective, tough, severe, rough) | |
| effortful(adjective, great, tough, rough) | |
| harrowing(adjective, severe, difficult, tender) | |
| time-consuming(tough, difficult, slow, heavy) | |
| labored(adjective, great, tough, rough) |
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| APA | Smart Define. (2016). arduous thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/arduous/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "arduous thesaurus" https://smartdefine.org/arduous/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2016, arduous thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/arduous/thesaurus/synonyms>. |
| MLA | Smart Define. "arduous thesaurus" 26 February 2016. Web. 24 September 2026. <https://smartdefine.org/arduous/thesaurus/synonyms> |