12
conflicting(adjective, negative, disgusting, reverse, hostile)
12
repugnant(adjective, bad, disgusting, reverse, hostile)
12
unfriendly(adjective, person, bad, disgusting, hostile)
12
unlucky(adjective, bad, unpleasant, negative, hostile)
11
antipathetic(adjective, support, negative, disgusting, hostile)
11
counter(adjective, negative, disgusting, reverse, hostile)
11
deleterious(adjective, distressing, unfavorable, hurtful, detrimental)
11
ill(adjective, bad, evil, negative, contrary)
10
damaging(adjective, bad, poor, detrimental, unlucky)
9
calamitous(adjective, bad, poor, sad, awkward)
9
evil(adjective, awful, dirty, gloom, badly)
9
not good
9
unfortunate(adjective, bad, poor, negative, awkward)
8
adversary(noun, adjective, opponent, opposed)
8
baleful(adjective, harmful, threatening, injurious, unfavorable)
8
contradictory(adjective, bad, negative, disgusting, hostile)
8
prejudicial(adjective, distressing, harmful, injurious, unfavorable)
7
pernicious(adjective, contrary, dreadful, distressing, injurious)
7
hurtful(adjective, contrary, distressing, threatening, injurious)
7
ruinous(adjective, bad, poor, awkward, inappropriate)
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APASmart Define. (2016). adverse thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/adverse/thesaurus/synonyms
ChicagoSmart Define. 2016. "adverse thesaurus" https://smartdefine.org/adverse/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2016, adverse thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/adverse/thesaurus/synonyms>.
MLASmart Define. "adverse thesaurus" 29 March 2016. Web. 22 September 2026. <https://smartdefine.org/adverse/thesaurus/synonyms>