alarmingness
appallingness
awfulness
creepiness
direness
disconcertingness
dismayingness
disquietingness
dreadfulness
eeriness
fearfulness
fearsomeness
frighteningness
frightfulness
ghastliness
ghoulishness
grimness
grisliness
gruesomeness
hideousness
horribleness
spookiness
startlingness
terribleness
uncanniness
weirdness