the GNU version of the Collaborative International Dictionary of English
n. One who is apt to blunder.
The Century Dictionary and Cyclopedia
n. One who blunders.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. someone who makes mistakes because of incompetence
Word Usage
""'Since sectarians, as in general every kind of blunderer and miracle-man, are toppled by reality at each step, they live in a state of perpetual exasperation, complaining about the"