bun·gle 
(bŭnggəl)
(bŭnggəl)v. bun·gled, bun·gling, bun·gles
v.tr.
To carry out badly or ruin through ineptitude; botch. See Synonyms at botch.
v.intr.
To work or act ineptly or inefficiently.
n.
A clumsy or inept performance; a botch: made a bungle of the case due to inexperience.
[Perhaps of Scandinavian origin.]
bungler n.
bungling·ly adv.