alarming
appalling
awing
browbeating
bulldozing
bullying
chilling
cowing
daunting
demoralization
deterrent
deterring
dire
disconcerting
discouraging
disheartening
dismaying
disquieting
distressing
dreadful
fear-inspiring
fearful
fearsome
formidable
frightful
hair-raising
harrowing
hectoring
horrifying
intimidating
intimidation
overawing
petrifying
psychological warfare
scaring
scary
shocking
spooky
startling
terrifying
war of nerves
brightening
enlightening
heightening
lightening
lightning
tightening
whitening