115 entries under heavy topic. ×
| slavish(adjective, tough, rough, difficult) | |
| strictly business(expression, adjective, great, weighty) | |
| tiring(adjective, tough, severe, rough, difficult) | |
| troublesome(adjective, hard, tough, severe, rough) | |
| underlined(adjective, big, unusual, important) | |
| uphill battle(expression, adjective, tough, rough, difficult) | |
| vexatious(adjective, hard, severe, rough, difficult) | |
| wearing(adjective, hard, tough, rough, difficult) | |
| wearisome(adjective, hard, tough, severe, rough) | |
| wearying(adjective, tough, rough, difficult) | |
| wise(adjective, reasonable, keen, deep) | |
| afflictive(adjective, severe, acute, dangerous) | |
| big deal(expression, big, substantial) | |
| blue-chip | |
| bulky(big, significant, substantial, large) | |
| cumbersome(severe, harsh, big, substantial) | |
| cumbrous(big, substantial) | |
| dense(adjective, strong, hard, tough, big) | |
| fat(adjective, big, substantial, bulky) | |
| feller(adjective, resolute, acute, destructive) |
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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> |