alarming
disorienting
impressive
analgesic
anesthetic
bloodcurdling
deadening
dulling
exceptional
extraordinary
fabulous
hair-raising
indescribable
ineffable
legendary
marvelous
mythical
narcotic
noteworthy
numbing
paralyzing
petrifying
phenomenal
portentous
prodigious
remarkable
stunning
stupendous
terrifying
terror
terror-bearing
terror-breathing
terror-breeding
terror-bringing
terror-fraught
terror-giving
terror-inspiring
terror-striking
terrorful
terroristic
unexampled
unparalleled
unprecedented
unspeakable
wonderful