- Definitions|2
- Thesaurus|2.1k
- Abbreviations|0
92 entries under hard topic. ×
| murder(adjective, great, tough, severe) | |
| nagging(adjective, tough, difficult, painful) | |
| perplexing(adjective, fancy, severe, difficult) | |
| puzzling(adjective, fancy, severe, difficult) | |
| recondite(adjective, fancy, difficult, complex) | |
| rigid(adjective, tough, severe, rough) | |
| strict(adjective, tough, severe, rough) | |
| unyielding(adjective, tough, severe, grim) | |
| various(adjective, fancy, difficult, complex) | |
| wheels within wheels(expression, adjective, idiom, fancy) | |
| clamorous(adjective, tough, difficult, challenging) | |
| unpermissive(adjective, severe, rough, difficult) |
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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> |