Mishandled, past participle of mishandle. Synonyms in the same form.
Muff
muffed, bungled, botched, ruined, blown, spoilt, fumbled, polluted, fluffed, bumbled, bobbled, flubbed, bodged, bollixed, vitiated, bollocksed
Abuse
abused, misused, mauled
Mismanage
mismanaged, misconducted
All synonyms for mishandle →