impressive
incredible
unbelievable
amazing
appalling
astonishing
awe-inspiring
awesome
awful
breathtaking
confounding
dire
direful
dread
dreaded
fell
formidable
ghastly
ghoulish
grim
grisly
gruesome
hideous
horrendous
horrible
horrid
horrific
horrifying
macabre
mind-boggling
miraculous
morbid
overwhelming
prodigious
redoubtable
schrecklich
shocking
spectacular
staggering
startling
stunning
stupendous
surprising
terrible
terrific
tremendous
wonderful
wondrous
abounding
bounding
compounding
expounding
founding
grounding
hounding
impounding
pounding
rebounding
resounding
rounding
sounding
surrounding