1. Incapable of being controlled or managed
   "uncontrollable children";
   - uncorrectable, unmanageable
    
2. Impossible to repress or control
   "uncontrollable laughter";
   - irrepressible
    
3. Difficult to solve or alleviate
   "uncontrollable pain";
   - unmanageable
    
4. Failing to follow rules or orders
   "the little boy's parents think he is spirited, but his teacher finds him uncontrollable";
   - indocile, ungovernable, unruly

See also: difficult, incorrigible, intractable, irreformable, uncontrolled, unmanageable

Encyclopedia: Uncontrollable