259 entries under tough topic. ×

20
unbending(adjective, clear, strong, hard)
19
critical(adjective, hard, difficult, harsh)
19
unfeeling(adjective, person, mean, hard)
18
relentless(adjective, appearance, mean, strong, hard)
17
dour(adjective, hard, firm, attitude)
17
keen(adjective, clear, strong, cool)
17
pitiless(adjective, person, mean, hard)
17
unyielding(adjective, appearance, mean, clear, strong)
16
cold(adjective, calm, mean, hard, cool)
16
heavy(adjective, strong, hard, difficult)
16
obdurate(adjective, mean, strong, hard)
16
stiff(adjective, hard, rough, firm)
15
dangerous(adjective, help, bad, hard)
15
inhuman(adjective, person, mean, hard)
15
onerous(adjective, hard, rough, difficult)
15
ruthless(adjective, appearance, mean, hard)
15
unpleasant(adjective, hard, difficult, harsh)
15
unsympathetic(adjective, person, mean, hard)
14
inexorable(adjective, appearance, mean, strong, hard)
14
merciless(adjective, appearance, mean, hard)
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APASmart Define. (2016). severe thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/severe/thesaurus/synonyms
ChicagoSmart Define. 2016. "severe thesaurus" https://smartdefine.org/severe/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2016, severe thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/severe/thesaurus/synonyms>.
MLASmart Define. "severe thesaurus" 24 March 2016. Web. 28 September 2026. <https://smartdefine.org/severe/thesaurus/synonyms>