Synonyms|527Antonyms|111|Broader|20Narrower|54Related|356

62 entries under main topic. ×

3
basal(adjective, base, basic, key)
3
elemental(adjective, base, basic, key)
3
first(adjective, important, master, essential, key)
3
head(noun, adjective, important, essential)
3
indispensable(adjective, base, basic, key)
3
paramount(adjective, important, essential, chief)
3
primal(adjective, base, important, essential, basic)
3
supreme(adjective, important, essential, chief)
3
controlling(adjective, important, essential, chief)
3
outstanding(adjective, important, essential, chief)
3
stellar(adjective, important, essential, chief)
2
basic(adjective, essential, prime, necessary)
2
fundamental(adjective, essential, prime, necessary)
2
decisive(adjective, essential, prime, necessary)
2
imperative(adjective, essential, prime, necessary)
1
consequential(adjective, important, essential, chief)
1
critical(adjective, principal, predominant)
1
inherent(adjective, base, basic, key)
1
intrinsic(adjective, base, basic, key)
1
momentous(adjective, important, essential, chief)
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ChicagoSmart Define. 2015. "ancillary thesaurus" https://smartdefine.org/ancillary/thesaurus/antonyms (accessed September 25, 2026).
HarvardSmart Define 2015, ancillary thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/ancillary/thesaurus/antonyms>.
MLASmart Define. "ancillary thesaurus" 10 April 2015. Web. 25 September 2026. <https://smartdefine.org/ancillary/thesaurus/antonyms>