Synonyms|95Antonyms|1|Broader|0Narrower|0Related|7

64 entries under adjective topic. ×

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flinty(strong, hard, tough, sturdy)
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forbidding(strong, hard, tough, sturdy)
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frowning(strong, hard, tough, sturdy)
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grim(strong, hard, tough, sturdy)
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hang-tough(strong, hard, tough, sturdy)
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hard(strong, tough, sturdy, rigid)
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hard-boiled(strong, hard, tough, sturdy)
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hard-core(strong, hard, tough, sturdy)
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hard-line(strong, hard, tough, sturdy)
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hard-nosed(strong, hard, tough, sturdy)
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hard-shell(strong, hard, tough, sturdy)
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hard as nails(expression, idiom, strong, hard)
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hardheaded(strong, hard, tough, sturdy)
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harsh(strong, hard, tough, sturdy)
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heavy(strong, hard, tough, sturdy)
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immovable(strong, hard, tough, sturdy)
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implacable(strong, hard, tough, sturdy)
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indomitable(strong, hard, tough, sturdy)
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inexorable(strong, hard, tough, sturdy)
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inflexible(strong, hard, tough, sturdy)
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APASmart Define. (2015). ferrous thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/ferrous/thesaurus/synonyms
ChicagoSmart Define. 2015. "ferrous thesaurus" https://smartdefine.org/ferrous/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, ferrous thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/ferrous/thesaurus/synonyms>.
MLASmart Define. "ferrous thesaurus" 13 April 2015. Web. 25 September 2026. <https://smartdefine.org/ferrous/thesaurus/synonyms>