hexakosioihexekontahexaphobia
octophobia
triskaidekaphobia
dread
ph33r
petrifying
clithrophobia
omphalophobia
shitting planks
fearing
crap one's pants
piss one's pants
paraskavedekatriaphobia
friggatriskaidekaphobia
phobiaphobia
chilling
knee-trembling
panic attack
scare
petrified
frighten
fearful
fright
affright
thanatophobia
scaaared
claustrophobia
flip one's lid
scarily
out of one's skin
jerran
ascared
fearfully
fear
terrifiedness
afraidly
quakingly
stasiphobia
overfearfulness
concerned
eleutherophobia
ambulophobia
alarmingly
gliff
numerophobia
freaky
nomatophobia
brick it
flay
scareful