65 entries under serious topic. ×

2
all-important(adjective, important, grave, dangerous)
2
clamorous(adjective, hard, tough, difficult, important)
2
determining(big, important, significant, substantial)
2
distressing(adjective, hurt, angry, sore)
2
exceptive(adjective, severe, harsh, important)
2
grievous(adjective, hard, great, tough, difficult)
2
influential(adjective, great, important, significant)
2
outstanding(adjective, great, important, lively, significant)
2
paramount(direct, prompt, important, significant)
1
burning(adjective, sharp, tender, important, extreme)
1
clamant(adjective, important, extreme, essential)
1
earth-shaking(adjective, important, significant, historic)
1
earth-shattering(important, significant, historic)
1
importunate(adjective, hard, tough, difficult, big)
1
life and death(expression, idiom, great, heavy, important)
1
major-league(adjective, great, extraordinary, important, outstanding)
1
radical(adjective, great, important, original)
0
afflictive(adjective, severe, heavy, acute)
0
overshadowing(great, important)
0
preeminent(great, important, key, chief)
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APASmart Define. (2016). critical thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/critical/thesaurus/synonyms
ChicagoSmart Define. 2016. "critical thesaurus" https://smartdefine.org/critical/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2016, critical thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/critical/thesaurus/synonyms>.
MLASmart Define. "critical thesaurus" 16 February 2016. Web. 29 September 2026. <https://smartdefine.org/critical/thesaurus/synonyms>