159 entries under adjective topic. ×

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ferric(strong, hard, tough, sturdy)
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ferrous(strong, hard, tough, sturdy)
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heavy(strong, hard, tough, sturdy)
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immutable
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insensible(strong, hard, tough, sturdy)
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invariable
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levelheaded(hard, tough, shrewd, stubborn)
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practicable
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robust(strong, hard, tough, sturdy)
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rugged(strong, hard, tough, sturdy)
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shrewd(hard, tough, sharp, practical)
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steel(strong, hard, tough, sturdy)
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strict(strong, hard, tough, severe)
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thick(strong, hard, tough, sturdy)
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unaccommodating
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unmoving
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unshakeable
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unvaried
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unvarying
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APASmart Define. (2015). mulish thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/mulish/thesaurus/synonyms
ChicagoSmart Define. 2015. "mulish thesaurus" https://smartdefine.org/mulish/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2015, mulish thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/mulish/thesaurus/synonyms>.
MLASmart Define. "mulish thesaurus" 13 April 2015. Web. 27 September 2026. <https://smartdefine.org/mulish/thesaurus/synonyms>