73 entries under heavy topic. ×

65
important(adjective, great, tough, severe, extraordinary)
60
critical(adjective, great, severe, extraordinary, big)
46
vital(adjective, great, severe, big)
29
urgent(adjective, tough, severe, big)
25
momentous(adjective, great, tough, severe, extraordinary)
25
serious(adjective, great, severe, extraordinary, big)
19
significant(adjective, great, tough, severe, extraordinary)
17
grave(adjective, great, tough, severe, big)
16
major(adjective, great, tough, severe)
16
pressing(adjective, tough, severe, big)
11
acute(adjective, severe, important, significant)
11
weighty(adjective, great, tough, severe, big)
9
consequential(adjective, big, important, lively)
5
exigent(adjective, big, important, significant)
5
great(extraordinary, important, significant, extreme)
5
life-and-death(adjective, important, serious, critical)
5
severe(adjective, tough, big, deep)
4
chief(adjective, great, big, important)
4
notable(adjective, great, important, lively)
4
portentous(adjective, big, significant, substantial)
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APASmart Define. (2016). crucial thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/crucial/thesaurus/synonyms
ChicagoSmart Define. 2016. "crucial thesaurus" https://smartdefine.org/crucial/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2016, crucial thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/crucial/thesaurus/synonyms>.
MLASmart Define. "crucial thesaurus" 11 March 2016. Web. 29 September 2026. <https://smartdefine.org/crucial/thesaurus/synonyms>