Pocket Thesaurus
Synonyms of tough-nut
adamant, firm, hardheaded, implacable, incompliant, inexorable, inflexible, intransigent, mulish, obdurate, obstinate, opinionated, pigheaded, relentless, remorseless, rigid, unbendable, unbending, unbreakable, uncompliant, uncompromising, unrelenting, unyielding
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