pestiferous
Carrying harmful contagion
Pestiferous means pest-bearing or plague-carrying, though it's now used mostly as an emphatic literary synonym for annoying or troublesome: those pestiferous gnats, a pestiferous neighbor who won't stop complaining.
The word carries a whiff of melodrama, suggesting the speaker finds something not just bothersome but insufferably so.
Causing mild frustration
- bothersomeCausing mild annoyance
- vexingCausing mild torment
- exasperatingIntensely irritating
- aggravatingCausing irritation or worsening
irksome · galling · nettlesome · provoking · nagging · pestering · infuriating · maddening
Offensive or illegal
- poisonousCapable of causing death
- harmfulCausing damage or injury
- venomousProducing injected toxins
- toxicCapable of causing harm
deadly · pernicious · baneful · mephitic · malodorous · stinking · putrid · fetid
Deadly epidemic disease
- contagiousTransmissible between people
- infectedInvaded by pathogens
- epidemicWidespread disease occurrence
- pandemicGlobal disease outbreak
outbreak · pathogenic · virulent · infectious · contaminated · blighted · sickly · fever
irritating
Causing mild frustration
- bothersomeCausing mild annoyance
- vexingCausing mild torment
- exasperatingIntensely irritating
aggravating · irksome · galling · nettlesome · provoking · nagging · pestering · infuriating · maddening · grating
foul
Offensive or illegal
toxic · deadly · pernicious · baneful · mephitic · malodorous · stinking · putrid · fetid · noisome
plague
Deadly epidemic disease
- contagiousTransmissible between people
- infectedInvaded by pathogens
- epidemicWidespread disease occurrence
pandemic · outbreak · pathogenic · virulent · infectious · contaminated · blighted · sickly · fever · quarantine
pestiferouswholesome
Conducive to well-being
healthful · salubrious · beneficial · salutary · antiseptic
pestiferousvirtuous
Morally excellent, principled
upstanding · edifying · wholesome · exemplary · constructive
pest, pests, infested, pesticide, infest, infestation, pesticides, pestilence, pestilent