The Collaborative International Dictionary of English v.0.48:

Fumble \Fum"ble\, v. i. [imp. & p. p. Fumbled; p. pr. & vb. n.
   Fumbling.] [Akin to D. fommelen to crumple, fumble, Sw.
   fumla to fusuble, famla to grope, Dan. famle to grope,
   fumble, Icel. falme, AS. folm palm of the hand. See Feel,
   and cf. Fanble, Palm.]
   1. To feel or grope about; to make awkward attempts to do or
      find something.
      [1913 Webster]

            Adams now began to fumble in his pockets.
                                                  --Fielding.
      [1913 Webster]

   2. To grope about in perplexity; to seek awkwardly; as, to
      fumble for an excuse. --Dryden.
      [1913 Webster]

            My understanding flutters and my memory fumbles.
                                                  --Chesterfield.
      [1913 Webster]

            Alas! how he fumbles about the domains.
                                                  --Wordsworth.
      [1913 Webster]

   3. To handle much; to play childishly; to turn over and over.
      [1913 Webster]

            I saw him fumble with the sheets, and play with
            flowers.                              --Shak.
      [1913 Webster]

WordNet (r) 3.0 (2006):

fumbling
    adj 1: showing lack of skill or aptitude; "a bungling workman";
           "did a clumsy job"; "his fumbling attempt to put up a
           shelf" [syn: bungling, clumsy, fumbling,
           incompetent]

Moby Thesaurus II by Grady Ward, 1.0:

48 Moby Thesaurus words for "fumbling":
   all thumbs, awkward, blunderheaded, blunderheadedness, blundering,
   boggling, boorish, botchery, botching, bumbling, bungling,
   butterfingered, careless, carelessness, clownish, clumsy,
   clumsy-fisted, cumbersome, fingers all thumbs, gauche, gawkish,
   gawky, graceless, ham-fisted, ham-handed, heavy-handed, hulking,
   hulky, inelegant, left-hand, left-handed, loutish, lubberly,
   lumbering, lumpish, maladroit, muffing, oafish, ponderous,
   sloppiness, sloppy, stiff, too many cooks, uncouth, ungainly,
   ungraceful, unhandy, unwieldy