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