- Definitions|2
- Thesaurus|2.4k
- Abbreviations|0
77 entries under severe topic. ×
| heavy(adjective, feature, characteristic, tough) | |
| herculean(adjective, feature, characteristic, tough) | |
| immense(adjective, feature, characteristic, great, tough) | |
| onerous(adjective, tough, difficulty, difficult) | |
| arduous(adjective, tough, difficulty, rough) | |
| tough(adjective, strong, difficulty, rough) | |
| laborious(adjective, tough, difficulty, rough) | |
| difficult(adjective, hard, tough, evil) | |
| hard(adjective, tough, evil, difficulty) | |
| burdensome(adjective, tough, difficult, heavy) | |
| menacing(adjective, bad, tough, unpleasant) | |
| strenuous(adjective, tough, rough, difficult) | |
| toilsome(adjective, tough, difficulty, difficult) | |
| uphill(adjective, tough, rough, difficult) | |
| demanding(adjective, tough, rough, difficult) | |
| effortful(adjective, tough, difficult, heavy) | |
| rugged(adjective, hard, evil, rough) | |
| challenging(adjective, tough, difficult, awkward) | |
| dangerous(adjective, hard, tough, evil) | |
| grim(adjective, appearance, bad, manner) |
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| APA | Smart Define. (2015). formidable thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/formidable/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "formidable thesaurus" https://smartdefine.org/formidable/thesaurus/synonyms (accessed September 20, 2026). |
| Harvard | Smart Define 2015, formidable thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/formidable/thesaurus/synonyms>. |
| MLA | Smart Define. "formidable thesaurus" 17 July 2015. Web. 20 September 2026. <https://smartdefine.org/formidable/thesaurus/synonyms> |