ultrahazardous
unchancy
hazardize
hazardously
pestilent
baneful
pernicious
deadly
dangerously
risky
on thin ice
supercatastrophic
cataclysmic
cataclysmal
hairy
venturesome
valley of the shadow of death
perilous
death-defying
distress
supertoxic
hypertoxic
macrodestructive
gnarly
riskily
axe murderer
precariousness
ultradestructive
catastrophal
equitoxic
plightly
inimical
overdestructiveness
dreadful
minefield
perilously
hypercontaminated
dangerous
poisonously
overdestructive
harmfully
pollutedly
periculous
intolerable
multihazard
superlethal
supervulnerable
deathtrap
hyperpathogenic
pathogenically