stumbler (n.)

  1. a walker or runner who trips and almost falls

    [ Syn: tripper ]

  2. someone who makes mistakes because of incompetence

    [ Syn: bungler , blunderer , fumbler , bumbler , sad sack , botcher , butcher , fuckup ]

The dictionary is based on the WordNet Electronic Lexical Database.
WordNet 3.0 Copyright 2011 by Princeton University. All rights reserved.