Synonyms for Fumble (same or very similar meaning)
WordNet sense 1 (make a mess of, destroy or ruin):
blow, bobble, bollix, botch, bumble, bungle, flub, fluff, mishandle, spoil, screw up, bodge, bollix up, bollocks up, botch up, louse up, muck upWordNet sense 2 (make one's way clumsily or blindly):
blunderWordNet sense 3 (feel about uncertainly or blindly):
gropeFrom the ODE community, based on WordNetadd/edit