5
venomous(adjective, bad, evil, harmful, injurious)
5
virulent(adjective, help, unhealthy, deadly, unwholesome)
4
bothersome
4
evil(adjective, bad, corrupt, harmful, injurious)
4
foul(adjective, bad, offensive, disgusting, vile)
4
galling
4
hurtful(adjective, bad, evil, harmful, injurious)
4
injurious(adjective, bad, foul, harmful, damaging)
4
irritating
4
malign(adjective, virulent)
4
malodorous(adjective, bad, offensive, foul, disgusting)
4
mephitic(adjective, bad, evil, offensive, foul)
4
mortal(adjective, bad, evil, harmful, injurious)
4
pesky
4
pestering
4
plaguey
3
annoying
3
catching
3
contagious(adjective, communicable)
3
insalubrious(offensive, foul, disgusting, harmful, poisonous)
11 years ago|5.6k views|share |citing 
APASmart Define. (2015). pestilential thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/pestilential/thesaurus/synonyms
ChicagoSmart Define. 2015. "pestilential thesaurus" https://smartdefine.org/pestilential/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, pestilential thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/pestilential/thesaurus/synonyms>.
MLASmart Define. "pestilential thesaurus" 14 April 2015. Web. 23 September 2026. <https://smartdefine.org/pestilential/thesaurus/synonyms>