59 entries under adjective topic. ×

3
mischievous
3
perilous
3
pernicious
3
prejudicial
3
unhealthy
2
grievous(severe, painful)
2
malevolent(good, hateful)
2
noisome
2
offensive
2
pestilent
2
toxic
2
unwholesome
1
formidable(horrible, terrifying)
1
nasty
1
disadvantageous
1
disastrous
1
infectious(catching, spreading)
1
negative
1
sinful
1
unfavorable
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APASmart Define. (2016). harmless thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/harmless/thesaurus/antonyms
ChicagoSmart Define. 2016. "harmless thesaurus" https://smartdefine.org/harmless/thesaurus/antonyms (accessed September 23, 2026).
HarvardSmart Define 2016, harmless thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/harmless/thesaurus/antonyms>.
MLASmart Define. "harmless thesaurus" 24 March 2016. Web. 23 September 2026. <https://smartdefine.org/harmless/thesaurus/antonyms>