115 entries under heavy topic. ×
| fell(adjective, unpleasant, important, significant) | |
| sobersided(adjective, work) | |
| in earnest(noun, adjective, idiom, work) | |
| wicked(adjective, bad, nasty, harsh, unpleasant) | |
| abstruse(intense, deep, fierce, thoughtful) | |
| destructive(adjective, acute, dangerous, aper) | |
| harsh(adjective, strong, hard, tough, severe) | |
| hazardous(adjective, bad, severe, significant) | |
| recondite(intense, deep, fierce, thoughtful) | |
| rigorous(adjective, strong, hard, tough, severe) | |
| speculative(bad, thoughtful, thinking, risky) | |
| treacherous(adjective, bad, nasty, delicate, unpleasant) | |
| uphill(adjective, tough, easy, rough, difficult) | |
| onerous(adjective, hard, tough, severe, rough) | |
| big-time | |
| bothersome(adjective, hard, tough, rough, difficult) | |
| chief(adjective, great, big, important) | |
| delicate(adjective, bad, nasty, terrible) | |
| difficile(adjective, tough, rough, difficult) | |
| discerning(adjective, reasonable, keen, sensible) |
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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> |