Synonyms|231Antonyms|1|Broader|0Narrower|0Related|38
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hardheaded(adjective, strong, hard, tough, severe)
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headstrong(adjective, impulsive, stubborn, reckless, impetuous)
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heedless(determined, impulsive, stubborn, reckless, impetuous)
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hell-bent(adjective, persistent, obstinate, insistent, dogged)
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hidebound(adjective, persistent, obstinate, insistent, dogged)
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imprudent(determined, impulsive, stubborn, reckless, heedless)
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insubordinate(adjective, persistent, obstinate, insistent, dogged)
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insurgent(adjective, persistent, obstinate, insistent, dogged)
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invincible(adjective, persistent, obstinate, insistent, dogged)
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iron(adjective, persistent, obstinate, insistent, dogged)
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locked-in(determined, impulsive, stubborn, reckless, heedless)
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mortified(adjective, strong, hard, tough, severe)
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mule(determined, impulsive, stubborn, reckless, heedless)
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mulish(adjective, strong, hard, tough, severe)
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murder(determined, impulsive, stubborn, reckless, heedless)
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mutinous(adjective, persistent, obstinate, insistent, dogged)
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narrow-minded(adjective, persistent, obstinate, insistent, dogged)
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obsessive(adjective, persistent, obstinate, insistent, dogged)
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persistent(adjective, obstinate, insistent, dogged)
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pig-headed(determined, impulsive, stubborn, reckless, impetuous)
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APASmart Define. (2013). hard-shell thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/hard-shell/thesaurus/synonyms
ChicagoSmart Define. 2013. "hard-shell thesaurus" https://smartdefine.org/hard-shell/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2013, hard-shell thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/hard-shell/thesaurus/synonyms>.
MLASmart Define. "hard-shell thesaurus" 17 June 2013. Web. 20 September 2026. <https://smartdefine.org/hard-shell/thesaurus/synonyms>