WordWeb Online

1. Made afraid
   "the frightened child cowered in the corner";
   - scared
    
2. Thrown into a state of intense fear or desperation
   "became frightened as the snow deepened";
   - panicky, panicked, panic-stricken, panic-struck, terrified

1. Cause fear in
   "The stranger who hangs around the building frightens me";
   - fright [archaic], scare, affright

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

Type of: excite, shake, shake up, stimulate, stir

Encyclopedia: Frightened