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Noun: bumbler  búm-bu-lu(r)
Usage: informal
  1. Someone who makes mistakes because of incompetence
    "The new employee was a bumbler, constantly misplacing important documents";
    - bungler, blunderer, stumbler, sad sack [N. Amer, informal], botcher, butcher

Derived forms: bumblers

Type of: incompetent, incompetent person