27
harmful(adjective, good, bad, disagreeable, harmless)
12
detrimental(adjective, good, damaging, disadvantageous)
9
unhelpful(adjective, bad, disagreeable, helpful)
6
bad(adjective, disagreeable, harmful)
5
unfavorable
5
destructive
5
not helpful
4
injurious(adjective, good, bad, disagreeable, hurtful)
4
unprofitable(adjective, useless)
4
baneful(adjective, injurious, ruinous)
4
disadvantageous(adjective, bad, disagreeable)
4
adverse
4
unfortunate(adjective, bad, disagreeable)
4
insalubrious
3
deleterious
3
hurtful(adjective, bad, kind, friendly, disagreeable)
3
self-destructive
3
unfriendly
3
useless(adjective, bad, disagreeable)
2
damaging
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APASmart Define. (2016). beneficial thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/beneficial/thesaurus/antonyms
ChicagoSmart Define. 2016. "beneficial thesaurus" https://smartdefine.org/beneficial/thesaurus/antonyms (accessed September 28, 2026).
HarvardSmart Define 2016, beneficial thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/beneficial/thesaurus/antonyms>.
MLASmart Define. "beneficial thesaurus" 24 March 2016. Web. 28 September 2026. <https://smartdefine.org/beneficial/thesaurus/antonyms>