WordWeb Online

1. Suggesting an unhealthy mental state
   "morbid interest in death"; "morbid curiosity"
    
2. Suggesting the horror of death and decay
   "morbid details";
   - ghoulish
    
3. Caused by or altered by or manifesting disease or pathology
   "a morbid growth";
   - diseased, pathologic, pathological

See also: offensive, unhealthy, unwholesome

Encyclopedia: Morbid