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

23 entries under base topic. ×

10
main(adjective, important, essential, basic)
10
necessary(adjective, basic, prime, key)
7
primary(adjective, important, essential, basic)
7
key(adjective, important, essential, basic)
6
principal(adjective, important, essential, basic)
6
central(adjective, important, essential, basic)
6
vital(adjective, important, essential, basic)
5
chief(adjective, basic, prime, key)
5
capital(adjective, important, essential, basic)
5
underlying(adjective, essential, basic, prime)
4
essential(adjective, basic, prime, key)
3
basal(adjective, basic, key, main)
3
elemental(adjective, basic, key, main)
3
indispensable(adjective, basic, key, main)
3
primal(adjective, important, essential, basic)
1
inherent(adjective, basic, key, main)
1
intrinsic(adjective, basic, key, main)
1
pivotal(adjective, basic, key, main)
1
primordial(adjective, basic, key, main)
1
substantial(adjective, basic, key, main)
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APASmart Define. (2015). ancillary thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/ancillary/thesaurus/antonyms
ChicagoSmart Define. 2015. "ancillary thesaurus" https://smartdefine.org/ancillary/thesaurus/antonyms (accessed September 22, 2026).
HarvardSmart Define 2015, ancillary thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/ancillary/thesaurus/antonyms>.
MLASmart Define. "ancillary thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/ancillary/thesaurus/antonyms>