noun

An anxious awareness of danger.

the boat tilted and the boatmen cried out in alarm

fear,anxiety,apprehension,trepidation,nervousness,unease,distress,agitation,consternation,disquiet,perturbation,fright,panic,dread,horror,shock,terror

verb

Cause (someone) to feel frightened, disturbed, or in danger.

the government was alarmed by an outbreak of unrest

frighten,scare,panic,startle,unnerve,distress,agitate,upset,fluster,ruffle,disconcert,shock,daunt,dismay,disturb,work up,terrify,terrorize,petrify,make someone’s blood run cold