Synonyms|1.7kAntonyms|434|Broader|22Narrower|6Related|2.8k

137 entries under hard topic. ×

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indomitable(adjective, strong, tough, sturdy)
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inexorable(adjective, strong, tough, sturdy)
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material(adjective, strong, substantial, compact)
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mortified(adjective, strong, tough, sturdy)
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mulish(adjective, strong, tough, sturdy)
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obdurate(adjective, strong, tough, sturdy)
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physical(adjective, strong, substantial, compact)
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relentless(adjective, strong, tough, sturdy)
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rock(adjective, strong, substantial, compact)
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rock-hard(adjective, compact, dense)
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rock-solid(adjective, compact, dense, rock-hard)
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rock hard(expression, adjective, strong, tough)
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rooted(adjective, strong, substantial, compact)
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rugged(adjective, strong, tough, rough)
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serious(adjective, strong, tough, sturdy)
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strict(adjective, strong, tough, sturdy)
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tough inflexible(expression, strong, tough, sturdy)
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HarvardSmart Define 2016, thick thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/thick/thesaurus/synonyms>.
MLASmart Define. "thick thesaurus" 26 February 2016. Web. 24 September 2026. <https://smartdefine.org/thick/thesaurus/synonyms>