4
critical(negative, disapproving, uncomplimentary, unhelpful)
4
difficult(adjective, difficult)
4
dim
4
dire(adjective, dreadful, adversity, threatening, unfortunate)
4
discordant(adjective, negative, hostile, inappropriate, antagonistic)
4
disturbing(adjective, unpleasant, unfortunate, troublesome, perverse)
4
enemy(noun, hostile, contrary, opponent, opposing)
4
harsh(adjective, difficult, negative, critical, disapproving)
4
inopportune(adjective, bad, poor, antagonistic, unfortunate)
4
malignant(adjective, mean, evil, nasty, unfriendly)
4
nasty(adjective, person, mean, bad, disgusting)
4
obstinate(adjective, cross, negative, hostile, different)
4
ominous(adjective, negative, threatening, menacing, unfavorable)
4
opponent
4
ornery(adjective, mean, informal, cross, negative)
4
tragic(adjective, bad, catastrophic)
3
adversative
3
antithetical(adjective, negative, hostile, antagonistic, contrary)
3
awful(adjective, catastrophic)
3
derogatory(negative, critical, damaging, disparaging, hurtful)
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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>