An act of incompetence or ineptitude.
present participle of bungle
showing lack of skill or aptitude
"a bungling workman"
"did a clumsy job"
"his fumbling attempt to put up a shelf"
lacking physical movement skills, especially with the hands
"a bumbling mechanic"
"a bungling performance"
"ham-handed governmental interference"
"could scarcely empty a scuttle of ashes, so handless was the poor creature"
Incompetent or inept.