1. Difficult to use or handle or manage because of size or weight or shape
   "almost dropped the unwieldy parcel"; "we set about towing the unwieldy structure into the shelter";
   - unmanageable
    
2. Difficult to work or manipulate
   "unwieldy rules and regulations"
    
3. Lacking grace in movement or posture
   "heaved his unwieldy figure out of his chair";
   - gawky, clumsy, clunky [informal], ungainly, klutzy [N. Amer, informal]

Derived forms: unwieldier, unwieldiest

See also: awkward, bunglesome, clumsy, cumbersome, cumbrous, impractical, ungainly