115 entries under heavy topic. ×
| effortful(adjective, hard, tough, severe, rough) | |
| exacting(adjective, hard, tough, severe, rough) | |
| exceptional(adjective, great, big, unusual) | |
| exhausting(adjective, hard, tough, severe, rough) | |
| exigent(adjective, hard, tough, difficult, big) | |
| fatiguing(adjective, tough, severe, rough, difficult) | |
| four-star | |
| front-page(great, big, significant, substantial) | |
| hairy(adjective, bad, rough, difficult) | |
| high-power | |
| irksome(adjective, tough, severe, rough, difficult) | |
| labored(adjective, hard, tough, severe, rough) | |
| life and death(expression, idiom, great, important) | |
| mean(adjective, tough, rough, difficult, unpleasant) | |
| merciless(adjective, tough, severe, rough, difficult) | |
| obscure(adjective, dull, dark, gloomy) | |
| playing hard ball(expression, adjective, idiom, great) | |
| pre-eminent | |
| professional(great, practical, controlled, orderly) | |
| scabrous(adjective, tough, rough, difficult) |
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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> |