- Definitions|2
- Thesaurus|1.8k
- Abbreviations|0
58 entries under heavy topic. ×
| painful(adjective, hard, tough, severe, difficult) | |
| taxing | |
| toilsome(adjective, hard, tough, severe, rough) | |
| trying | |
| uphill(adjective, hard, tough, severe, rough) | |
| difficile(adjective, tough, rough, difficult) | |
| excessive(adjective, severe, difficult, harsh) | |
| grinding(adjective, tough, severe, rough, difficult) | |
| hairy(adjective, tough, severe, rough, difficult) | |
| intolerable(adjective, tough, severe, harsh) | |
| knotty(adjective, tough, severe, rough, difficult) | |
| operose(adjective, hard, tough, severe, rough) | |
| troublesome(adjective, hard, tough, severe, rough) | |
| weighty | |
| backbreaking(adjective, hard, tough, severe, rough) | |
| complicated(adjective, tough, rough, difficult) | |
| distressing(adjective, tough, severe, rough, difficult) | |
| fatiguing(adjective, hard, tough, severe, rough) | |
| grueling(adjective, hard, tough, severe, difficult) | |
| involved(adjective, tough, rough, difficult) |
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| APA | Smart Define. (2016). rigorous thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/rigorous/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "rigorous thesaurus" https://smartdefine.org/rigorous/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2016, rigorous thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/rigorous/thesaurus/synonyms>. |
| MLA | Smart Define. "rigorous thesaurus" 26 February 2016. Web. 23 September 2026. <https://smartdefine.org/rigorous/thesaurus/synonyms> |