A bungler is someone who is incompetent and frequently makes mistakes. Bunglers goof things up.

To bungle is to make a mess of something, and a bungler is someone who typically screws things up. A thief who always gets caught is a bungler. An actor who constantly forgets lines is a bungler. A politician who makes a lot of gaffes and mistakes is a bungler. If you want a job done right, don't ask a bungler to do it.

Definitions of bungler
  1. noun
    someone who makes mistakes because of incompetence
    synonyms: blunderer, botcher, bumbler, butcher, fumbler, sad sack, stumbler
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    type of:
    incompetent, incompetent person
    someone who is not competent to take effective action
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