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60 entries under strong topic. ×

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hard(tough, sturdy, rigid, rugged)
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hard-boiled(hard, tough, sturdy, rugged)
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hard-core(hard, tough, sturdy, rugged)
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hard-line(hard, tough, sturdy, rugged)
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hard-nosed(hard, tough, sturdy, rugged)
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hard-shell(hard, tough, sturdy, rugged)
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hard as nails(expression, idiom, hard, tough)
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hardheaded(hard, tough, sturdy, rugged)
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harsh(hard, tough, sturdy, rugged)
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heavy(hard, tough, sturdy, rigid)
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immovable(hard, tough, sturdy, rigid)
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implacable(hard, tough, sturdy, rigid)
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indomitable(hard, tough, sturdy, rigid)
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inexorable(hard, tough, sturdy, rigid)
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inflexible(hard, tough, sturdy, rugged)
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insensible(hard, tough, sturdy, rigid)
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iron(hard, tough)
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mortified(hard, tough, sturdy, rugged)
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mulish(hard, tough, sturdy, rugged)
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obdurate(hard, tough, sturdy, rigid)
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APASmart Define. (1970). tough inflexible thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/tough_inflexible/thesaurus/synonyms
ChicagoSmart Define. 1970. "tough inflexible thesaurus" https://smartdefine.org/tough_inflexible/thesaurus/synonyms (accessed October 1, 2026).
HarvardSmart Define 1970, tough inflexible thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/tough_inflexible/thesaurus/synonyms>.
MLASmart Define. "tough inflexible thesaurus" 1 January 1970. Web. 1 October 2026. <https://smartdefine.org/tough_inflexible/thesaurus/synonyms>