Someone who makes mistakes because of incompetence

Usage examples of bumbler.

So, although he may yet be a bit of a bumbler, something of a bookish boob, a man given to a bit too much drinking, and still a klutz much top humanly prone to err, let us keep sight of the fact that he is learning something of the verities of Life-for he is, above all, a man of good intentions.

I turned the Bumbler on Festina, I could see the germs in her lungs, her stomach, her digestive tract, her bloodstream.

Thirty seconds later, I was on my feet, the Bumbler strapped to my back, and my stunner in hand.

You have to queue, and pay good money, to mingle with vituperative interpreters and flashlight-faced Japanese, balls-talking bumblers, vultures, students, loners, pick-ups, the determined samplers and consumers spun off by the thrashing city.

He didn't know how many bumblers had worn shoes in the history of the world, but he was willing to guess that none had ever been gifted with a set of silk-lined leather booties.

So he transformed the bumblers into Communists and delighted the general and his guests with questions such as, How many Communists does it take to screw in a light bulb?