4
bad(adjective, wicked, injurious, damaging, destructive)
4
belligerent(adjective, mean, nasty, unfriendly, hateful)
4
corrupting(harmful, injurious, damaging, destructive, inexpedience)
4
deathly
4
grim
4
infectious(adjective, catching, spreading)
4
malefic(adjective, injurious, damaging, deadly, destructive)
4
mischievous(adjective, mean, nasty, wicked, hateful)
4
mortal
4
noisome(unhealthy, harmful, injurious, noxious, poisonous)
4
pestiferous(adjective, unhealthy, harmful, injurious, annoying)
4
sour(adjective, mean, severe, nasty, hostile)
4
stringent(adjective, physical energy)
4
sulfurous
4
tart
4
unkind(adjective, mean, evil, nasty, harsh)
4
unpleasant
3
acidic
3
acute
3
barbarous(adjective, evil, nasty, harsh, vicious)
11 years ago|14k views|share |citing 
APASmart Define. (2015). virulent thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/virulent/thesaurus/synonyms
ChicagoSmart Define. 2015. "virulent thesaurus" https://smartdefine.org/virulent/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, virulent thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/virulent/thesaurus/synonyms>.
MLASmart Define. "virulent thesaurus" 3 August 2015. Web. 25 September 2026. <https://smartdefine.org/virulent/thesaurus/synonyms>