65 entries under problematic topic. ×

3
difficult(adjective, hard, tough, trying)
3
stiff(adjective, tough, extraordinary, extreme, grim)
2
exacting(tough, severe, painful, trying)
2
titanic(tough, severe, painful, trying)
1
ambitious(tough, severe, painful, trying)
1
arduous(tough, severe, painful, trying)
1
backbreaker(tough, severe, painful, trying)
1
bothersome(tough, severe, painful, trying)
1
burdensome(tough, severe, painful, trying)
1
challenging(tough, severe, painful, trying)
1
crucial(tough, severe, painful, trying)
1
demanding(tough, severe, painful, trying)
1
difficile(tough, severe, painful, trying)
1
easier said than done(expression, tough, severe, painful)
1
effortful(tough, severe, painful, trying)
1
galling(tough, severe, painful, trying)
1
gargantuan(tough, severe, painful, trying)
1
hard-won(tough, severe, painful, trying)
1
heavy(tough, severe, painful, trying)
1
herculean(tough, severe, painful, trying)
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APASmart Define. (2015). prohibitive thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/prohibitive/thesaurus/synonyms
ChicagoSmart Define. 2015. "prohibitive thesaurus" https://smartdefine.org/prohibitive/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, prohibitive thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/prohibitive/thesaurus/synonyms>.
MLASmart Define. "prohibitive thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/prohibitive/thesaurus/synonyms>