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6 entries under adjective topic. ×

2
dogged(determined, persistent)
1
hang tough(expression, tough, sharp, sensible)
1
immovable(steady, fixed, obstinate, stubborn)
1
intractable(sharp, difficult, practical, shrewd)
0
hardboiled(firm, dogged, immovable, level-headed)
0
level-headed(tough, sharp, sensible, sober)
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APASmart Define. (2011). tough nut thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/tough_nut/thesaurus/synonyms
ChicagoSmart Define. 2011. "tough nut thesaurus" https://smartdefine.org/tough_nut/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2011, tough nut thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/tough_nut/thesaurus/synonyms>.
MLASmart Define. "tough nut thesaurus" 23 May 2011. Web. 27 September 2026. <https://smartdefine.org/tough_nut/thesaurus/synonyms>