- Definitions|2
- Thesaurus|2.1k
- Abbreviations|0
134 entries under difficult topic. ×
| diligent(adjective, tedious, protracted) | |
| entangled(adjective, hard, fancy, complex) | |
| fancy(adjective, hard, complex, intricate) | |
| gasser(adjective, hard, fancy, complex) | |
| hellish(adjective, unpleasant, grim, savage) | |
| hi-tech(adjective, hard, fancy, complex) | |
| interlaced(adjective, hard, fancy, complex) | |
| mega factor(expression, adjective, hard, fancy) | |
| merciless(adjective, tough, severe, rough) | |
| mixed(adjective, hard, fancy, complex) | |
| murder(adjective, hard, great, tough, severe) | |
| nagging(adjective, hard, tough, painful) | |
| perplexing(adjective, hard, fancy, severe) | |
| puzzling(adjective, hard, fancy, severe) | |
| recondite(adjective, hard, fancy, complex) | |
| rigid(adjective, hard, tough, severe, rough) | |
| sapping(adjective, unpleasant, grim, savage) | |
| strict(adjective, hard, tough, severe, rough) | |
| testing(adjective, tough, severe, violent) | |
| unsparing(adjective, tough, rough, harsh) |
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| APA | Smart Define. (2016). arduous thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/arduous/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "arduous thesaurus" https://smartdefine.org/arduous/thesaurus/synonyms (accessed September 21, 2026). |
| Harvard | Smart Define 2016, arduous thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/arduous/thesaurus/synonyms>. |
| MLA | Smart Define. "arduous thesaurus" 26 February 2016. Web. 21 September 2026. <https://smartdefine.org/arduous/thesaurus/synonyms> |