WordWeb Online

1. Quick to understand
   "a kind and apprehensive friend";
   - discerning
    
2. Mentally upset over possible misfortune or danger etc
   "apprehensive about her job"; "felt apprehensive about the consequences";
   - worried
    
3. In fear or dread of possible evil or harm
   "apprehensive for one's life"; "apprehensive of danger"

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