4
unhealthful(offensive, foul, disgusting, harmful, poisonous)
4
unwholesome(offensive, foul, disgusting, harmful, injurious)
4
venomous(adjective, bad, evil, harmful, injurious)
3
catching
3
cranky
3
detrimental(adjective, bad, evil, harmful, injurious)
3
envenomed
3
epizootic
3
inconvenient(adjective, troublesome, bothersome)
3
infective
3
infuriating
3
loathsome(adjective, bad, nasty, offensive, terrible)
3
maddening
3
malignant(adjective, bad, injurious, damaging, deadly)
3
mephitic
3
painful(adjective, injurious, damaging, destructive, disorderly)
3
peevish
3
polluted
3
unhygienic
2
bad(offensive, foul, disgusting, injurious, damaging)
11 years ago|8.5k views|share |citing 
APASmart Define. (2015). pestiferous thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/pestiferous/thesaurus/synonyms
ChicagoSmart Define. 2015. "pestiferous thesaurus" https://smartdefine.org/pestiferous/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2015, pestiferous thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/pestiferous/thesaurus/synonyms>.
MLASmart Define. "pestiferous thesaurus" 10 April 2015. Web. 26 September 2026. <https://smartdefine.org/pestiferous/thesaurus/synonyms>