Synonyms|665Antonyms|174|Broader|10Narrower|15Related|812
2
evitable
2
excess
2
extraneous(adjective, unneeded)
2
redundant
2
supernumerary
2
unessential
2
unneeded
2
weed
1
accessorial
1
accessory
1
additional(adjective, unimportant, trivial, extra, supplementary)
1
auxiliary
1
avertable
1
excessive(moderate, low)
1
external
1
extrinsic(adjective, foreign)
1
in addition
1
inconsequential
1
insignificant(adjective, unimportant, trivial)
1
preventable
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APASmart Define. (2015). necessary thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/necessary/thesaurus/antonyms
ChicagoSmart Define. 2015. "necessary thesaurus" https://smartdefine.org/necessary/thesaurus/antonyms (accessed September 24, 2026).
HarvardSmart Define 2015, necessary thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/necessary/thesaurus/antonyms>.
MLASmart Define. "necessary thesaurus" 2 November 2015. Web. 24 September 2026. <https://smartdefine.org/necessary/thesaurus/antonyms>