Synonyms|824Antonyms|324|Broader|9Narrower|29Related|2.1k
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hardboiled(weak, yielding)
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hardened
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hardline
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having a killer instinct(expression, idiom, calm, gentle)
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headstrong
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heavy-handed
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hell bent on(expression, idiom, kind)
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high-principled(apathetic, inconstant)
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husky
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ill-humored
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impede
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impenetrable
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impermeable
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impervious
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impregnable
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inalienable
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inalterable
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incendiary
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incommutable
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inconvertible
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APASmart Define. (2016). flexible thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/flexible/thesaurus/antonyms
ChicagoSmart Define. 2016. "flexible thesaurus" https://smartdefine.org/flexible/thesaurus/antonyms (accessed September 25, 2026).
HarvardSmart Define 2016, flexible thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/flexible/thesaurus/antonyms>.
MLASmart Define. "flexible thesaurus" 28 March 2016. Web. 25 September 2026. <https://smartdefine.org/flexible/thesaurus/antonyms>