WordWeb Online

1. Difficult to solve or alleviate
   "unmanageable pain";
   - uncontrollable
    
2. Incapable of being controlled or managed
   "unmanageable children";
   - uncontrollable, uncorrectable
    
3. Difficult to use or handle or manage because of size or weight or shape
   "we set about towing the unmanageable structure into the shelter";
   - unwieldy
    
4. Hard to control
   "an unmanageable situation";
   - difficult

See also: awkward, bunglesome, clumsy, cumbersome, cumbrous, defiant, disobedient, incorrigible, indocile, intractable, noncompliant, uncheckable, uncontrollable, ungainly, ungovernable, unruly