Synonyms For "Mishandle" :

1 syllable:

blow, bodge, botch, flub, fluff, muff, spoil

2 syllables:

ball up, bobble, bollix, bollocks, botch up, bumble, bungle, foul up, fuck up, fumble, louse up, mess up, muck up, screw up

3 syllables:

bollix up, bollocks up, misconduct, mismanage