75 entries under adjective topic. ×

1
wrinkled(hard, durable)
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adamant
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arduous
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bad
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brawny(strong, hard, solid, stiff)
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close
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compressed
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concrete
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condensed
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conditioned(strong, hard, solid, stiff)
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difficult
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fit(strong, hard, solid, stiff)
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gnarled
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granite
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hard-bitten(strong, hard, solid, stiff)
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hard as nails(expression, idiom, strong, hard)
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impenetrable
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impervious
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impregnable
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indigestible(strong, hard, solid, stiff)
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APASmart Define. (2015). leathery thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/leathery/thesaurus/synonyms
ChicagoSmart Define. 2015. "leathery thesaurus" https://smartdefine.org/leathery/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2015, leathery thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/leathery/thesaurus/synonyms>.
MLASmart Define. "leathery thesaurus" 14 April 2015. Web. 27 September 2026. <https://smartdefine.org/leathery/thesaurus/synonyms>