200 entries under hard topic. ×

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ferrous(adjective, strong, tough, sturdy)
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gruff(adjective, severe, sharp, nasty)
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hairy(adjective, severe, sharp, nasty)
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heavy(adjective, strong, tough, sturdy)
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imperceptive(adjective, indifferent, unkind, unresponsive)
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indomitable(adjective, strong, tough, sturdy)
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intolerant(adjective, cold, indifferent, unfeeling)
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nasty(adjective, severe, sharp, bleak)
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punitive(adjective, severe, sharp, nasty)
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rude(adjective, severe, sharp, nasty)
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rugged(adjective, strong, tough, severe)
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steel(adjective, strong, tough, sturdy)
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strong(adjective, tough, sturdy, rugged)
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sturdy(adjective, strong, tough, rugged)
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tactless(adjective, indifferent, unkind, unresponsive)
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thick(adjective, strong, tough, sturdy)
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tough inflexible(expression, strong, tough, sturdy)
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uncivil(adjective, severe, sharp, nasty)
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ungracious(adjective, severe, sharp, nasty)
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wicked(adjective, severe, sharp, nasty)
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APASmart Define. (2016). hard-boiled thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/hard-boiled/thesaurus/synonyms
ChicagoSmart Define. 2016. "hard-boiled thesaurus" https://smartdefine.org/hard-boiled/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2016, hard-boiled thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/hard-boiled/thesaurus/synonyms>.
MLASmart Define. "hard-boiled thesaurus" 23 March 2016. Web. 29 September 2026. <https://smartdefine.org/hard-boiled/thesaurus/synonyms>