Source : Webster's Revised Unabridged Dictionary (1913)

Alarmed \A*larmed"\, a.
   Aroused to vigilance; excited by fear of approaching danger;
   agitated; disturbed; as, an alarmed neighborhood; an alarmed
   modesty.

         The white pavilions rose and fell On the alarmed air.
                                                  --Longfellow.

Alarm \A*larm"\, v. t. [imp. & p. p. {Alarmed}; p. pr. & vb. n.
   {Alarming}.] [Alarm, n. Cf. F. alarmer.]
   1. To call to arms for defense; to give notice to (any one)
      of approaching danger; to rouse to vigilance and action;
      to put on the alert.

   2. To keep in excitement; to disturb.

   3. To surprise with apprehension of danger; to fill with
      anxiety in regard to threatening evil; to excite with
      sudden fear.

            Alarmed by rumors of military preparation.
                                                  --Macaulay.

Source : WordNet®

alarmed
     adj : experiencing a sudden sense of danger