harmful
baneful
black
calamitous
cataclysmal
cataclysmic
consuming
consumptive
deadly
demolishing
demolitionary
depredatory
desolating
destroying
destructive
devastating
dire
disastrous
doomful
fatal
fateful
fratricidal
grievous
insurrectionary
internecine
nihilist
nihilistic
radical
ravaging
revolutional
revolutionary
revulsionary
revulsive
ruining
ruinous
self-destructive
subversionary
subversive
suicidal
sweeping
tragic
transilient
vandalic
vandalish
vandalistic
wasteful
wasting
withering
wreckful
adverse
appal
climatic
deplorable
devastate
horrendous
horrific
imminent
irreversible
life-threatening
ongoing
unavoidable
unexplained
unforeseen
unintended
unprecedented
untoward
geostrophic
heterotrophic
philosophic