79 entries under hard topic. ×

19
knotted(adjective, difficulty, difficult, complex)
19
knotty(adjective, difficulty, difficult, complex)
19
labyrinthine(adjective, difficulty, difficult, complex)
19
painful(adjective, tough, difficult, harsh)
19
plodding(adjective, difficult, complex)
18
complicated(adjective, difficulty, difficult, complex)
18
rough(adjective, strong, tough, difficult)
17
grievous(adjective, tough, difficult, harsh)
17
resistant(adjective, characteristic, quality, determined)
17
thorny(adjective, difficulty, difficult, complex)
17
trying(adjective, difficulty, difficult, complex)
15
bullheaded(adjective, characteristic, quality, strong)
15
set in stone(expression, adjective, idiom, mean)
14
difficult(adjective, complex, change, position)
14
adamantine(adjective, characteristic, quality, strong)
14
iron(adjective, characteristic, quality, mean, strong)
11
strong(adjective, tough, firm, violent)
10
hanging tough(expression, adjective, mean, determined)
10
indomitable(adjective, strong, tough, difficult)
9
stern(adjective, appearance, tough, rough)
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APASmart Define. (2015). stubborn thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/stubborn/thesaurus/synonyms
ChicagoSmart Define. 2015. "stubborn thesaurus" https://smartdefine.org/stubborn/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2015, stubborn thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/stubborn/thesaurus/synonyms>.
MLASmart Define. "stubborn thesaurus" 3 August 2015. Web. 28 September 2026. <https://smartdefine.org/stubborn/thesaurus/synonyms>