alarming
appalling
astounding
atrocious
awe-inspiring
awesome
awful
baneful
beastly
dire
direful
dread
dreaded
dreadful
fell
formidable
ghastly
ghoulish
grim
grisly
gruesome
hideous
horrendous
horrible
horrid
horrific
lurid
macabre
morbid
redoubtable
rotten
schrecklich
shocking
terrible
terrific
terrifying
tragic
tremendous
unspeakable
glorifying