noxious (adj.)
- abhorrent
- abominable
- bad
- baleful
- baneful
- base
- beastly
- bitchy
- brackish
- catching
- cloying
- communicable
- contagious
- contaminated
- contemptible
- corrosive
- corrupting
- corruptive
- counterproductive
- crude
- cussed
- damaging
- deadly
- deleterious
- despicable
- destructive
- detestable
- detrimental
- disadvantageous
- disgusting
- distressing
- execrable
- fecal
- fetid
- forbidding
- foul
- frowsty
- frowzy
- fulsome
- funky
- fusty
- gamy
- gross
- harmful
- hateful
- heinous
- high
- hurtful
- icky
- ignoble
- ill-smelling
- infectious
- infective
- iniquitous
- injurious
- insalubrious
- insanitary
- invidious
- lethal
- loathsome
- maggoty
- malefic
- maleficent
- malevolent
- malicious
- malign
- malignant
- malodorous
- mawkish
- mean
- mephitic
- miasmal
- miasmic
- mischievous
- moldy
- morbific
- musty
- nasty
- nauseating
- nauseous
- noisome
- objectionable
- obnoxious
- obscene
- odious
- odorous
- offensive
- olid
- ominous
- ornery
- overripe
- pathogenic
- peccant
- pernicious
- pestiferous
- pestilent
- pestilential
- poisonous
- polluted
- prejudicial
- putrid
- rancid
- rank
- reasy
- rebarbative
- reechy
- reeking
- repellent
- repugnant
- repulsive
- revolting
- rotten
- septic
- sickening
- sickly
- smelling
- smelly
- spoiled
- stinking
- strong
- stuffy
- sulfurous
- tainted
- toxic
- toxicant
- unhealthful
- unhealthy
- unhygienic
- unsanitary
- unwholesome
- venomous
- vicious
- vile
- virulent
- wicked
- yucky
