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hard as nails(expression, idiom, pleasant, easy, bright)
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hard put
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hard to please
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hard up
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hardboiled(easy, bright)
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harsh
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headstrong
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heavy
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immutable
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impenetrable
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impermeable
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inclement
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inelastic
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inexorable
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inflammatory
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insubordinate
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intransigent
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invariable
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lusty
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merciless
10 years ago|1.8k views|share |citing 
APASmart Define. (2016). malleable thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/malleable/thesaurus/antonyms
ChicagoSmart Define. 2016. "malleable thesaurus" https://smartdefine.org/malleable/thesaurus/antonyms (accessed September 27, 2026).
HarvardSmart Define 2016, malleable thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/malleable/thesaurus/antonyms>.
MLASmart Define. "malleable thesaurus" 23 March 2016. Web. 27 September 2026. <https://smartdefine.org/malleable/thesaurus/antonyms>