109 entries under hard topic. ×

3
iron(adjective, persistent, rigid, obstinate)
3
merciless(adjective, rough, harsh, cruel)
3
rough(adjective, strong, tough, severe)
3
serious(adjective, strong, tough, severe)
3
stiff-necked(adjective, strong, tough, severe)
2
brutal(adjective, tough, severe, rough)
2
inclement(adjective, tough, severe, rough)
2
by the book(expression, adjective, idiom, strong)
2
callous(adjective, tough, severe, rough)
2
dense(adjective, strong, tough, sturdy)
2
disciplinary(adjective, strong, tough, severe)
2
flinty(adjective, strong, tough, severe)
2
grievous(adjective, tough, severe, difficult)
2
hard-core(adjective, close, strong, tough)
2
implacable(adjective, set, strong, tough)
2
ironclad(adjective, set, severe, harsh)
2
steely(adjective, set, strong, tough)
2
unforgiving(adjective, rough, harsh, cruel)
1
bitter(adjective, strong, tough, severe)
1
arduous(adjective, tough, severe, rough)
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APASmart Define. (2015). strict thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/strict/thesaurus/synonyms
ChicagoSmart Define. 2015. "strict thesaurus" https://smartdefine.org/strict/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, strict thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/strict/thesaurus/synonyms>.
MLASmart Define. "strict thesaurus" 3 August 2015. Web. 24 September 2026. <https://smartdefine.org/strict/thesaurus/synonyms>