do someone a frighten
scare the hell out of
spook out
jump in one's skin
piss one's pants
crap one's pants
spook
fearing
flay
frighten the piss out of
timorsome
fearful
overfrighten
poopless
put the wind up
funk
frightenable
frighten the life out of someone
scare someone to death
terrify
scare the shit out of
fear
frightsomeness
brick it
scareful
terrifiedness
frightfulness
make someone's hair stand on end
have the wind up
ph33r
frightenedness
startful
out of one's skin
tingle
shiver
quiver
chill
flaysome
fray
frightened
tremble
scared
thrill
run scared
frisson
shudder
eerie
frightenedly
fearmonger
apprehend