The Collaborative International Dictionary of English v.0.48:

bungled \bungled\ adj.
   performed poorly or inadequately; as, a bungled job; the
   Watergate scandal started with a bungled burglary.

   Syn: botched, goofed up.
        [WordNet 1.5]

The Collaborative International Dictionary of English v.0.48:

Bungle \Bun"gle\, v. i. [imp. & p. p. Bungled; p. pr. & vb. n.
   Bungling.] [Prob. a diminutive from, akin to bang; cf.
   Prov. G. bungen to beat, bang, OSw. bunga. See Bang.]
   To act or work in a clumsy, awkward manner.
   [1913 Webster]

WordNet (r) 3.0 (2006):

bungled
    adj 1: spoiled through incompetence or clumsiness; "a bungled
           job" [syn: bungled, botched]