3
vexatious
2
affected(adjective, diseased)
2
aggravating
2
baleful
2
contagious(adjective, unhealthy, dangerous)
2
corrupting(adjective, harmful, dangerous, catching, poisonous)
2
ill(adjective, diseased)
2
irksome
2
malign
2
mischievous
2
nettlesome
2
septic(adjective, unhealthy, insalubrity)
2
sickly(adjective, harmful, diseased, poisonous, toxic)
2
subtle
2
tiresome
2
vexing
2
worrisome
2
worrying
1
ailing(adjective, diseased)
1
azotic
11 years ago|7.7k views|share |citing 
APASmart Define. (2015). pestilent thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/pestilent/thesaurus/synonyms
ChicagoSmart Define. 2015. "pestilent thesaurus" https://smartdefine.org/pestilent/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2015, pestilent thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/pestilent/thesaurus/synonyms>.
MLASmart Define. "pestilent thesaurus" 14 April 2015. Web. 27 September 2026. <https://smartdefine.org/pestilent/thesaurus/synonyms>