116 entries under tough topic. ×

3
single-minded(adjective, firm, harsh, cruel)
3
strenuous(adjective, severe, difficult, painful)
3
trying(adjective, severe, difficult, grim)
3
unflexible(adjective, hard, firm, rigid)
2
Herculean(adjective, severe, difficult, painful)
2
boorish(problematic, trying)
2
burdensome(adjective, severe, difficult, painful)
2
congealed(adjective, set, hard, firm)
2
demanding(adjective, hard, severe, rough)
2
effortful(severe, difficult, painful, problematic)
2
fractious(adjective, problematic, trying)
2
gelatinous(adjective, set, solid, heavy)
2
impenetrable(adjective, set, hard, firm)
2
incompliant(adjective, hard, severe, firm)
2
oafish(tasteless, problematic, unsophisticated, clumsy)
2
onerous(adjective, severe, difficult, painful)
2
tiresome(difficult, boring, tedious, problematic)
2
titanic(severe, painful, problematic, trying)
1
ambitious(severe, painful, problematic, trying)
1
backbreaker(severe, painful, problematic, trying)
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APASmart Define. (2015). stiff thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/stiff/thesaurus/synonyms
ChicagoSmart Define. 2015. "stiff thesaurus" https://smartdefine.org/stiff/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2015, stiff thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/stiff/thesaurus/synonyms>.
MLASmart Define. "stiff thesaurus" 24 December 2015. Web. 28 September 2026. <https://smartdefine.org/stiff/thesaurus/synonyms>