
Bungler
Negative Connotation
Implies a lack of skill and competence.

In every group project, he was the bungler who jeopardized our success.
Often Inept
Used when mistakes are frequent, not just a one-time event.

She didn't trust the bungler to handle the delicate negotiations.
Not Malicious
A bungler's actions are due to ineptitude, not intentional harm.

Though a bungler at chores, he never meant to break the vase.
Compare with
AwkwardClumsyIncompetentIneptMaladroitNovice
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