98 entries under tough topic. ×

2
rigid(adjective, strong, hard, severe)
2
serious(adjective, strong, hard, severe)
2
steely(adjective, strong, hard, severe)
2
strong(adjective, hard, sturdy, rugged)
2
unruly(difficult, determined, awkward, impulsive)
1
astringent(adjective, strong, hard, severe)
1
astute(adjective, hard, sharp, practical)
1
austere(adjective, strong, hard, severe)
1
authoritarian(adjective, strong, hard, severe)
1
bitter(adjective, strong, hard, severe)
1
by the book(expression, adjective, idiom, strong, hard)
1
cantankerous(adjective, firm, difficult, wild)
1
contumacious(firm, deliberate, determined, unreasonable)
1
cussed(firm, unreasonable, grim, inflexible)
1
disciplinary(adjective, strong, hard, severe)
1
dyed-in-the-wool(adjective, strong, hard, severe)
1
fixed(severe, firm, stiff, inflexible)
1
flinty(adjective, strong, hard, severe)
1
forbidding(adjective, strong, hard, severe)
1
frowning(adjective, strong, hard, severe)
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APASmart Define. (2015). bullheaded thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/bullheaded/thesaurus/synonyms
ChicagoSmart Define. 2015. "bullheaded thesaurus" https://smartdefine.org/bullheaded/thesaurus/synonyms (accessed September 30, 2026).
HarvardSmart Define 2015, bullheaded thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/bullheaded/thesaurus/synonyms>.
MLASmart Define. "bullheaded thesaurus" 13 April 2015. Web. 30 September 2026. <https://smartdefine.org/bullheaded/thesaurus/synonyms>