verb

carry out (a task) clumsily or incompetently.

he bungled his first attempt to manage a group of professional players

mishandle,mismanage,mess up,make a mess of,botch,spoil,mar,ruin,make a hash of,muff,fluff,foul up,screw up,louse up,bitch up,blow,foozle,make a muck of,make a pig’s ear of,cock up,make a Horlicks of,flub,goof up,bobble,fuck up,bollix up,bugger up,balls up

noun

a task carried out in a clumsy or incompetent way.