12
considerable(adjective, important, significant, substantial, large)
11
key(adjective, lead, important, head, significant)
11
serious(adjective, great, unpleasant, heavy, important)
10
star(adjective, bad, great, excellent, lead)
10
arch(adjective, lead, superior, rank, head)
10
critical(adjective, great, heavy, important, significant)
10
higher(adjective, big, rank, new, large)
10
notable(adjective, great, heavy, important, wonderful)
10
noteworthy(adjective, good, important, wonderful, exceptional)
10
paramount(adjective, good, fine, important, famous)
10
vital(adjective, great, heavy, important, significant)
9
cardinal(adjective, lead, important, head, significant)
9
grave(adjective, great, tough, severe, unpleasant)
9
large(adjective, reasonable, fair, big, important)
9
substantial(adjective, good, great, reasonable, fair)
8
elder(adjective, rank, post, status, age)
8
first(adjective, top, superior, unusual, important)
8
uppermost(adjective, lead, rank, head, master)
7
big-league(adjective, lead, informal, important, head)
7
central(adjective, lead, important, head, significant)
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APASmart Define. (2015). major thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/major/thesaurus/synonyms
ChicagoSmart Define. 2015. "major thesaurus" https://smartdefine.org/major/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, major thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/major/thesaurus/synonyms>.
MLASmart Define. "major thesaurus" 6 July 2015. Web. 21 September 2026. <https://smartdefine.org/major/thesaurus/synonyms>