115 entries under heavy topic. ×

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fierce(intense, aper, demoniac, annihilative)
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fleshy(big, substantial)
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forcible(big, substantial)
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grueling(adjective, severe, difficult, harsh)
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heightened(adjective, intense, fierce)
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herculean(adjective, tough, rough, difficult)
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killing(adjective, acute, dangerous, crucial)
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major league(expression, great)
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obese(big, substantial)
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of great consequence(expression, adjective, idiom, acute)
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ominous(adjective, unpleasant, horrible, disagreeable)
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overweight(big, substantial)
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porcine(big, substantial)
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portly(big, substantial)
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stout(big, significant, substantial, large)
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APASmart Define. (2016). serious thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/serious/thesaurus/synonyms
ChicagoSmart Define. 2016. "serious thesaurus" https://smartdefine.org/serious/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2016, serious thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/serious/thesaurus/synonyms>.
MLASmart Define. "serious thesaurus" 24 February 2016. Web. 28 September 2026. <https://smartdefine.org/serious/thesaurus/synonyms>