Synonyms|127Antonyms|52|Broader|0Narrower|0Related|569

110 entries under adjective topic. ×

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sacrosanct
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seasoned(strong, hard, solid, stiff)
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shatter-proof
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steeled(strong, hard, solid, stiff)
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thick(firm, stiff, rigid)
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tough as nails(expression, idiom, strong, hard)
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unalterable
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unchanging
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uncompromising
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withstanding(strong, hard, solid, stiff)
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APASmart Define. (2016). unbreakable thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/unbreakable/thesaurus/synonyms
ChicagoSmart Define. 2016. "unbreakable thesaurus" https://smartdefine.org/unbreakable/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2016, unbreakable thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/unbreakable/thesaurus/synonyms>.
MLASmart Define. "unbreakable thesaurus" 5 January 2016. Web. 26 September 2026. <https://smartdefine.org/unbreakable/thesaurus/synonyms>