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Noun: sad sack
Usage: N. Amer, informal
  1. Someone who makes mistakes because of incompetence
    "The company finally fired the sad sack after he botched another important project";
    - bungler, blunderer, bumbler [informal], stumbler, botcher, butcher

Derived forms: sad sacks

Type of: incompetent, incompetent person

Encyclopedia: Sad sack