loud
deafening
anguished
banshee
bell-like
blood-chilling
blood-freezing
bloodcurdling
cacophonous
deep-throated
deep-toned
drawn-out
eldritch
full-throated
high-pitched
horrendous
long-drawn
percussive
red-alert
stentorian
strident
thunderous
tinny
ululant
unearthly
wordless