See mishandle in Webster's New World Roget's A-Z Thesaurus II
verb
To use wrongly and improperly:
abuse, misapply, misappropriate, misuse, pervert. See treat wellTo harm irreparably through inept handling; make a mess:
ball up, blunder, boggle, botch, bungle, foul up, fumble, gum up, mess up, mismanage, muddle, muff, spoil. (Informal) bollix up, muck up. (Slang) blow1, goof up, louse up, screw up, snafu. Idiom: make a muck of. See correct, helpTo hurt or injure by maltreatment:
abuse, ill-treat, ill-use, maltreat, mistreat, misuse. See help
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