WordWeb Online

1. Experiencing a sudden sense of danger
    
2. Having an alarm fitted
   "This door is alarmed"

1. Fill with apprehension or alarm; cause to be unpleasantly surprised
   "I was alarmed at the thought of being late for my interview";
   - dismay, appal [Brit, Cdn], appall [US], horrify
    
2. Warn or arouse to a sense of danger or call to a state of preparedness
   "The empty house alarmed him";
   - alert

See also: afraid, 'fraid [non-standard]

Type of: affright, fright [archaic], frighten, scare, warn

Encyclopedia: Alarmed