Synonyms|319Antonyms|166|Broader|2Narrower|0Related|1.1k
1
forbidding(adjective, strong, hard, tough, severe)
1
frowning(adjective, strong, hard, tough, severe)
1
hang-tough(adjective, strong, hard, tough, severe)
1
hanging(adjective, determined, resolute, obstinate, uncompromising)
1
hard-core(adjective, strong, hard, tough, severe)
1
hard-headed
1
hard-line(adjective, strong, hard, tough, severe)
1
hard-shell(adjective, strong, hard, tough, severe)
1
hard and fast(expression, adjective, idiom, inflexible, unbending)
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hardboiled(adjective, reasonable, firm, sensible, sober)
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hoaxproof
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incompliant(adjective, stubborn)
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insubordinate(tough, firm, unreasonable, grim, inflexible)
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intolerant
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jejune
1
knowing
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mortified(adjective, strong, hard, tough, severe)
1
mundane(adjective, reasonable, sensible, rational, straightforward)
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no-nonsense(adjective, tough, reasonable, sharp, sensible)
1
not born yesterday(expression, idiom)
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ChicagoSmart Define. 2015. "hardheaded thesaurus" https://smartdefine.org/hardheaded/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, hardheaded thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/hardheaded/thesaurus/synonyms>.
MLASmart Define. "hardheaded thesaurus" 13 April 2015. Web. 22 September 2026. <https://smartdefine.org/hardheaded/thesaurus/synonyms>