1. Experiencing a sudden sense of danger

1. Fill with apprehension or alarm; cause to be unpleasantly surprised
   - 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, alarmist, 'fraid [non-standard]

Type of: affright, fright, frighten, scare, warn

Encyclopedia: Alarm

• electronic
• electronic balance
• electronic bulletin board
• electronic communication
• electronic computer
• electronic converter
• electronic counter-countermeasures
• electronic countermeasures
• electronic data processing
• electronic database
• electronic deception
• electronic device
• electronic dictionary
• electronic equipment
• electronic fetal monitor
• electronic foetal monitor
• electronic funds transfer
• electronic image
• electronic imitative deception
• electronic information service
• electronic instrument
• electronic jamming
• electronic mail
• electronic manipulative deception
• electronic messaging