alarming
appalling
awe-inspiring
awesome
awing
bashful
chilling
cowardly
daunting
deterrent
deterring
diffident
disconcerting
discouraging
disheartening
dismaying
disquieting
dreadful
fear-inspiring
fearful
fearing
formidable
frightening
frightful
goosy
in fear
intimidating
jumpy
menacing
mousy
nervous
overawing
rabbity
scaring
scary
shaky
shivery
shrinking
shy
skittery
skittish
startling
startlish
terrible
terrifying
timid
timorous
fear
dismal
feral
ghastly
gruesome
horrendous
horrific
lesser
lethal
murderous
terrific
terrify
unearthly