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

• Thermopsis villosa
• Thermopylae
• thermoreceptor
• thermoregulator
• thermos
• thermos bottle
• thermos flask
• thermoscope
• thermoset
• thermosetting
• thermosetting compositions
• thermosetting resin
• thermosphere
• thermostat
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• thermotherapy
• thermotropic
• thermotropism
• thermowell
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• Crocodilia
• crocodilian