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56 entries under rugged topic. ×

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hard-boiled(strong, hard, tough, sturdy)
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hard-core(strong, hard, tough, sturdy)
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hard-line(strong, hard, tough, sturdy)
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hard-nosed(strong, hard, tough, sturdy)
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hard-shell(strong, hard, tough, sturdy)
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hardheaded(strong, hard, tough, sturdy)
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harsh(strong, hard, tough, sturdy)
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heavy(strong, hard, tough, sturdy, rigid)
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immovable(strong, hard, tough, sturdy, rigid)
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implacable(strong, hard, tough, sturdy, rigid)
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indomitable(strong, hard, tough, sturdy, rigid)
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inexorable(strong, hard, tough, sturdy, rigid)
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inflexible(strong, hard, tough, sturdy)
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insensible(strong, hard, tough, sturdy, rigid)
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mortified(strong, hard, tough, sturdy)
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mulish(strong, hard, tough, sturdy)
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obdurate(strong, hard, tough, sturdy, rigid)
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relentless(strong, hard, tough, sturdy, rigid)
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rigid(strong, hard, tough, sturdy)
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rigorous(strong, hard, tough, sturdy)
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APASmart Define. (1970). tough inflexible thesaurus. Retrieved October 2, 2026, from https://smartdefine.org/tough_inflexible/thesaurus/synonyms
ChicagoSmart Define. 1970. "tough inflexible thesaurus" https://smartdefine.org/tough_inflexible/thesaurus/synonyms (accessed October 2, 2026).
HarvardSmart Define 1970, tough inflexible thesaurus, Smart Define, viewed 2 October, 2026, <https://smartdefine.org/tough_inflexible/thesaurus/synonyms>.
MLASmart Define. "tough inflexible thesaurus" 1 January 1970. Web. 2 October 2026. <https://smartdefine.org/tough_inflexible/thesaurus/synonyms>