Synonyms|402Antonyms|192|Broader|3Narrower|12Related|1.1k
10
hurtful(adjective, bad, kind, friendly, cruel)
8
harmful(adjective, good, bad)
7
destructive
6
insidious
6
self-destructive
5
baneful
5
poisonous(adjective, harmful)
4
noxious(adjective, sweet, healthy)
4
unsafe(adjective, strong, secure, dangerous)
4
wicked
4
damaging
4
deleterious
4
detrimental
4
evil
4
injurious
4
malignant(adjective, wholesome, diseased)
4
risky(strong, safe)
3
bad
3
adverse
3
baleful
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APASmart Define. (2016). harmless thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/harmless/thesaurus/antonyms
ChicagoSmart Define. 2016. "harmless thesaurus" https://smartdefine.org/harmless/thesaurus/antonyms (accessed September 22, 2026).
HarvardSmart Define 2016, harmless thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/harmless/thesaurus/antonyms>.
MLASmart Define. "harmless thesaurus" 24 March 2016. Web. 22 September 2026. <https://smartdefine.org/harmless/thesaurus/antonyms>