20
hostile(adjective, rough, harsh)
18
malignant(adjective, wholesome, diseased)
11
hurtful(adjective, rough, harsh)
10
baneful
10
atrocious
10
harsh(adjective, rough)
9
bad(adjective, rough, harsh)
8
cancerous(adjective, rough, harsh)
7
harmful(adjective, rough, harsh)
6
adverse
5
malign(adjective, injurious, hurtful)
5
severe(adjective, rough, harsh)
5
baleful
5
dangerous
5
deleterious
5
injurious(adjective, rough, harsh)
5
violent(adjective, rough, harsh)
4
unkind(adjective, rough, harsh)
4
damaging
4
hateful(adjective, rough, harsh)
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APASmart Define. (2016). benign thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/benign/thesaurus/antonyms
ChicagoSmart Define. 2016. "benign thesaurus" https://smartdefine.org/benign/thesaurus/antonyms (accessed September 21, 2026).
HarvardSmart Define 2016, benign thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/benign/thesaurus/antonyms>.
MLASmart Define. "benign thesaurus" 24 March 2016. Web. 21 September 2026. <https://smartdefine.org/benign/thesaurus/antonyms>