alarm Synonyms

consternation apprehension terror alert dismay fright disquiet bell fear trepidation alarum dread concern horn alarm system appal worry warning panic horrify signal anxiety siren agitation shock appall affright semaphore whistle shrieker watchtower sign warn waker upset terrorise unstring wigwag worriment consternate tip off bell buoy trouble disquietude yelper yelp worrit scarify angst unsettle