This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. Someone who makes mistakes because of incompetence

n. A clumsy, awkward workman; one who bungles.

n. One who bungles; a clumsy, awkward workman; one who performs without skill.

n. someone who makes mistakes because of incompetence

"On Imrill Kand, he had been called bungler, a child bereft of common sense and shamefully slow to learn."

incompetent person    incompetent   

bungling    bungle   

fuckup    schlemiel    blunderer   

scribbler    serbonian    sciolism    ignoramus    touranian    nincompoop    dunce    greenhorn    blunderer    tripper