65 entries under hard topic. ×

43
harsh(adjective, tough, severe, rough)
31
rigorous(adjective, tough, severe, rough)
28
severe(adjective, tough, severe, rough)
27
strict(adjective, tough, severe, rough)
18
rigid(adjective, tough, severe, rough)
17
stern(adjective, tough, severe, rough)
17
austere(adjective, tough, severe, rough)
12
exacting(adjective, tough, severe, rough)
9
tough(adjective, severe, firm, difficult)
9
inflexible(adjective, severe, rough, difficult)
9
dour(adjective, tough, severe, firm)
8
uncompromising(adjective, severe, rough, difficult)
7
stiff(adjective, severe, rough, difficult)
7
relentless(adjective, set, severe, sharp)
5
oppressive(adjective, tough, severe, rough)
5
rough(adjective, severe, difficult, bleak)
5
sharp(adjective, strong, severe, nasty)
4
inclement(adjective, tough, severe, rough)
3
nasty(adjective, severe, sharp, bleak)
3
rugged(adjective, tough, severe, rough)
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APASmart Define. (2015). stringent thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/stringent/thesaurus/synonyms
ChicagoSmart Define. 2015. "stringent thesaurus" https://smartdefine.org/stringent/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, stringent thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/stringent/thesaurus/synonyms>.
MLASmart Define. "stringent thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/stringent/thesaurus/synonyms>