baneful (adj.)
- apocalyptic
- appalling
- atrocious
- awful
- bad
- baleful
- beastly
- black
- boding
- brutal
- calamitous
- cataclysmal
- cataclysmic
- catastrophic
- consuming
- consumptive
- corrosive
- corrupting
- corruptive
- counterproductive
- damaging
- dark
- deadly
- deathly
- deleterious
- destroying
- destructive
- detrimental
- devastating
- dire
- direful
- disadvantageous
- disastrous
- distressing
- dreadful
- dreary
- evil
- fatal
- fateful
- feral
- foreboding
- gloomy
- grim
- harmful
- hideous
- horrendous
- horrible
- horrid
- horrific
- horrifying
- hurtful
- ill
- ill-fated
- ill-omened
- ill-starred
- inauspicious
- injurious
- insalubrious
- internecine
- killing
- lethal
- lowering
- malefic
- malevolent
- malign
- malignant
- menacing
- mischievous
- mortal
- nihilistic
- noisome
- noxious
- ominous
- pernicious
- pestiferous
- pestilent
- pestilential
- poisonous
- portentous
- prejudicial
- ravaging
- rotten
- ruinous
- savage
- self-destructive
- shocking
- sinister
- somber
- subversive
- suicidal
- terrible
- threatening
- toxic
- tragic
- unfavorable
- unfortunate
- unhealthy
- unlucky
- unpromising
- unpropitious
- unspeakable
- untoward
- unwholesome
- venomous
- vicious
- virulent
- wasteful
- withering
