190 entries under tough topic. ×

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disciplinary(adjective, strong, hard, sturdy)
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dyed-in-the-wool(adjective, strong, hard, sturdy)
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ferric(adjective, strong, hard, sturdy)
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ferrous(adjective, strong, hard, sturdy)
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hang-tough(adjective, strong, hard, sturdy)
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hard-boiled(adjective, strong, hard, severe)
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hard-core(adjective, strong, hard, sturdy)
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hard-line(adjective, strong, hard, sturdy)
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hard-shell(adjective, strong, hard, severe)
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hardheaded(adjective, strong, hard, sturdy)
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immovable(adjective, strong, hard, sturdy)
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implacable(adjective, strong, hard, harsh)
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inexorable(adjective, strong, hard, harsh)
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intolerable(adjective, severe, harsh, grim)
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mortified(adjective, strong, hard, sturdy)
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mulish(adjective, strong, hard, sturdy)
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rancorous(adjective, harsh, grim, painful)
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resentful(adjective, severe, harsh, grim)
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steel(adjective, strong, hard, sturdy)
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stiff-necked(adjective, strong, hard, sturdy)
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APASmart Define. (2015). rugged thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/rugged/thesaurus/synonyms
ChicagoSmart Define. 2015. "rugged thesaurus" https://smartdefine.org/rugged/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2015, rugged thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/rugged/thesaurus/synonyms>.
MLASmart Define. "rugged thesaurus" 14 April 2015. Web. 29 September 2026. <https://smartdefine.org/rugged/thesaurus/synonyms>