The Collaborative International Dictionary of English v.0.48:

bumbling \bumbling\ adj.
   not skillful in physical movement especially with the hands;
   as, a bumbling mechanic.

   Syn: bungling, butterfingered, ham-fisted, ham-handed,
        handless, heavy-handed, left-handed.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

bumbling
    adj 1: lacking physical movement skills, especially with the
           hands; "a bumbling mechanic"; "a bungling performance";
           "ham-handed governmental interference"; "could scarcely
           empty a scuttle of ashes, so handless was the poor
           creature"- Mary H. Vorse [syn: bumbling, bungling,
           butterfingered, ham-fisted, ham-handed, handless,
           heavy-handed, left-handed]

Moby Thesaurus II by Grady Ward, 1.0:

44 Moby Thesaurus words for "bumbling":
   all thumbs, awkward, blunderheaded, blundering, boorish, bungling,
   butterfingered, careless, clownish, clumsy, clumsy-fisted,
   cumbersome, fingers all thumbs, fumbling, gauche, gawkish, gawky,
   graceless, halting, ham-fisted, ham-handed, heavy-handed, hulking,
   hulky, inelegant, inept, left-hand, left-handed, loutish, lubberly,
   lumbering, lumpish, maladroit, oafish, ponderous, sloppy, stiff,
   uncouth, ungainly, ungraceful, unhandy, unhappy, unwieldy,
   wooden