122 entries under hard topic. ×
| by the book(expression, adjective, idiom, strong) | |
| close(adjective, severe, harsh, cold) | |
| cold(adjective, calm, close, tough) | |
| demanding(adjective, tough, difficult, harsh) | |
| disciplinary(adjective, strong, tough, severe) | |
| dyed-in-the-wool(adjective, strong, tough, severe) | |
| effortful(adjective, tough, severe, rough) | |
| exacting(adjective, tough, severe, rough) | |
| exhausting(adjective, tough, severe, rough) | |
| exigent(adjective, tough, difficult, big) | |
| flinty(adjective, close, strong, tough) | |
| hang-tough(adjective, strong, tough, severe) | |
| hard-boiled(adjective, calm, strong, tough) | |
| hard-core(adjective, strong, tough, severe) | |
| hard-line(adjective, strong, tough, severe) | |
| hard-shell(adjective, strong, tough, severe) | |
| hardheaded(adjective, strong, tough, severe) | |
| importunate(tough, big, important, substantial) | |
| inflexible(adjective, strong, tough, severe) | |
| labored(adjective, tough, severe, rough) |
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| APA | Smart Define. (2016). serious thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/serious/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "serious thesaurus" https://smartdefine.org/serious/thesaurus/synonyms (accessed September 27, 2026). |
| Harvard | Smart Define 2016, serious thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/serious/thesaurus/synonyms>. |
| MLA | Smart Define. "serious thesaurus" 24 February 2016. Web. 27 September 2026. <https://smartdefine.org/serious/thesaurus/synonyms> |