WordWeb Online

1. Causing or fraught with or showing anxiety
   "spent an anxious night waiting for the test results"; "cast anxious glances behind her";
   - nervous, queasy, uneasy, unquiet
    
2. Eagerly desirous
   "anxious to see the new show at the museum";
   - dying

See also: antsy [N. Amer, informal], eager, fidgety, fretful, itchy, keen, keyed-up, on edge, restless, troubled, twitchy [informal]

Encyclopedia: Anxious