- Definitions|2
- Thesaurus|2.1k
- Abbreviations|0
92 entries under hard topic. ×
| knotty(adjective, severe, rough, difficult) | |
| tricky(adjective, difficult, complex, awkward) | |
| dire(adjective, difficult, complex, painful) | |
| thorny(adjective, difficult, complex, demanding) | |
| serious(adjective, tough, easy, difficult) | |
| sheer(adjective, sharp, difficult, complex) | |
| grinding(adjective, difficult, harsh, cruel) | |
| exhausting(adjective, dull, tough, difficult) | |
| onerous(adjective, dull, great, tough) | |
| unbearable(adjective, difficult, complex, painful) | |
| ambitious(adjective, ability, difficult, complex) | |
| weighty(adjective, difficult, heavy, complex) | |
| cruel(adjective, difficult, complex, painful) | |
| hefty(adjective, dull, difficult, harsh) | |
| intricate(adjective, difficult, complex, awkward) | |
| sensitive(adjective, difficult, complex, painful) | |
| Gordian(adjective, difficult, complex, intricate) | |
| byzantine(adjective, difficult, complex, intricate) | |
| elaborate(adjective, difficult, complex, grand) | |
| involved(adjective, difficult, complex, awkward) |
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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> |