90 entries under heavy topic. ×

10
great(extraordinary, important, significant, extreme)
10
nasty(adjective, mean, bad, harsh, unpleasant)
10
risky(adjective, bad, delicate, important)
9
touchy(adjective, mean, bad, difficult, delicate)
7
exigent(adjective, hard, tough, difficult, big)
6
thorny(bad, delicate, awkward, tricky)
5
destructive(adjective, negative, hostile, acute)
5
notable(adjective, great, important, lively)
5
portentous(adjective, bad, big, significant)
5
touch-and-go(adjective, bad, delicate, awkward)
5
ugly(adjective, mean, bad, nasty, cross)
4
life-and-death(adjective, important, serious, vital)
3
heavyweight(adjective, great, big, important)
3
threatening(adjective, bad, negative, dangerous)
3
unstable(adjective, bad, delicate, awkward)
3
wicked(adjective, mean, bad, harsh)
2
chancy(adjective, bad, delicate, tricky)
2
considerable(adjective, big, important, significant)
2
grievous(adjective, hard, great, tough, difficult)
2
malignant(adjective, mean, bad, nasty)
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APASmart Define. (2016). critical thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/critical/thesaurus/synonyms
ChicagoSmart Define. 2016. "critical thesaurus" https://smartdefine.org/critical/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2016, critical thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/critical/thesaurus/synonyms>.
MLASmart Define. "critical thesaurus" 16 February 2016. Web. 27 September 2026. <https://smartdefine.org/critical/thesaurus/synonyms>