6
catastrophic(adjective, dreadful, unfortunate, injurious, damaging)
6
cross(noun, ornery)
6
dangerous(adjective, distressing, harmful, injurious, damaging)
6
hard(adjective, difficult, angry, offended, indignant)
6
oppositional(adjective, support, hostile, contrary, opposing)
6
unpromising(adjective, negative, unfavorable, disapproving, ominous)
5
adversarial(adjective, support, hostile, antagonistic, contrary)
5
anti(adjective, mean, negative, hostile, unfriendly)
5
foul(bad, disgusting, vile, revolting, repulsive)
5
miserable
5
nocuous(adjective, distressing, harmful, injurious, damaging)
5
not helpful
5
noxious(adjective, awful, dirty, gloom, badly)
5
perverse(cross, unpleasant, negative, hostile, different)
5
sinister(adjective, evil, nasty, threatening, injurious)
5
troublesome(adjective, difficult, unpleasant, negative, critical)
5
unsatisfactory(adjective, help)
4
averse(adjective, disgusting, hostile, contrary, revolting)
4
baneful(distressing, harmful, threatening, injurious, damaging)
4
confronting(hostile, contrary, opposing, opposed)
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APASmart Define. (2016). adverse thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/adverse/thesaurus/synonyms
ChicagoSmart Define. 2016. "adverse thesaurus" https://smartdefine.org/adverse/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2016, adverse thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/adverse/thesaurus/synonyms>.
MLASmart Define. "adverse thesaurus" 29 March 2016. Web. 23 September 2026. <https://smartdefine.org/adverse/thesaurus/synonyms>