Synonyms|1kAntonyms|253|Broader|5Narrower|1Related|546

189 entries under severe topic. ×

7
dour(adjective, tough, firm, harsh)
7
firm(noun, adjective, strong, hard, complete)
7
grim(adjective, strong, hard, tough)
7
inexorable(adjective, strong, hard, tough)
7
laborious(adjective, hard, tough, rough)
7
obstinate(adjective, hard, resolute, rigid)
7
spartan(adjective, economical)
6
astringent(adjective, strong, hard, tough)
6
burdensome(adjective, hard, rough, difficult)
6
intense
6
keen(adjective, careful)
6
onerous(adjective, hard, rough, difficult)
6
unrelenting(adjective, strong, hard, tough)
5
Draconian(adjective, tough, firm, harsh)
5
extreme(adjective, harsh, cruel, brutal)
5
puritanical(adjective, tough, firm, harsh)
5
raw
5
undeviating(adjective, harsh, solid, exact)
5
unsparing(adjective, strong, hard, tough)
4
acrimonious(adjective, tough, harsh, grim)
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APASmart Define. (2016). rigorous thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/rigorous/thesaurus/synonyms
ChicagoSmart Define. 2016. "rigorous thesaurus" https://smartdefine.org/rigorous/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2016, rigorous thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/rigorous/thesaurus/synonyms>.
MLASmart Define. "rigorous thesaurus" 26 February 2016. Web. 23 September 2026. <https://smartdefine.org/rigorous/thesaurus/synonyms>