Synonyms|380Antonyms|13|Broader|2Narrower|0Related|410

57 entries under hard topic. ×

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ferrous(adjective, strong, tough, sturdy)
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firm(adjective, strong, tough, severe)
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heavy(adjective, upset, strong, tough)
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immovable(adjective, strong, tough, sturdy)
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indomitable(adjective, strong, tough, sturdy)
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insensible(adjective, strong, tough, sturdy)
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obdurate(adjective, strong, tough, sturdy)
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robust(adjective, strong, tough, sturdy)
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rugged(adjective, strong, tough, sturdy)
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steel(adjective, strong, tough, sturdy)
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strict(adjective, strong, tough, severe)
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strong(adjective, tough, sturdy, rugged)
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sturdy(adjective, strong, tough, rugged)
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thick(adjective, strong, tough, sturdy)
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tough inflexible(expression, strong, tough, sturdy)
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unbending(adjective, strong, tough, sturdy)
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unyielding(adjective, strong, tough, severe)
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APASmart Define. (2015). frowning thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/frowning/thesaurus/synonyms
ChicagoSmart Define. 2015. "frowning thesaurus" https://smartdefine.org/frowning/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, frowning thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/frowning/thesaurus/synonyms>.
MLASmart Define. "frowning thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/frowning/thesaurus/synonyms>