The Collaborative International Dictionary of English v.0.48:
Fumbler \Fum"bler\, n. One who fumbles. [1913 Webster]WordNet (r) 3.0 (2006):
fumbler n 1: someone who makes mistakes because of incompetence [syn: bungler, blunderer, fumbler, bumbler, stumbler, sad sack, botcher, butcher, fuckup]