alarming
bad
breakneck
chancy
concept
critical
dangerous
dangersome
deadly
delicate
dynamite
exposed
fatal
formidable
fragile
grunge
grungy
hairy
hazardous
heavy
hot
impending
impregnable
ink
insecure
jeopardous
loaded
malignant
menacing
miscellaneous
mortal
nasty
on collision course
parlous
perilous
ready
rectangular
red
rubber
sign
stamp
symbol
troubling
vulnerable
word