maleficent
noxious
apocalyptic
appalling
atrocious
awful
bad
baleful
beastly
black
bodeful
boding
brutal
calamitous
cataclysmal
cataclysmic
catastrophic
consuming
consumptive
corroding
corrosive
corrupting
corruptive
counterproductive
damaging
dark
deadly
death-bringing
deathful
deathly
deleterious
demolishing
demolitionary
depredatory
desolating
destroying
destructive
detrimental
devastating
dire
direful
disadvantageous
disastrous
disserviceable
distressing
doomful
dreadful
dreary
evil
evil-starred
beneficial
curative
devastate
harmful
hurtful
iniquitous
insalubrious
malign
nauseous
pernicious
pestiferous
pestilential
prejudicial
prevalent
rancorous
ruinous
salutary
soporific
unholy