An act of bumbling, a mistake or error especially through clumsiness.(noun)
Present participle of bumble.(verb)
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Use "bumbling" in a sentence
"The Senate Homeland Security Committee says the Federal Emergency Management Agency, FEMA, has become a symbol of what it calls bumbling bureaucracy, and it should be abolished."
"But it falls flat in the futuristic fridge, and she calls a bumbling Quantum Mechanic"
"The handsome Canadian spent more than 60 years doing serious roles in movies and on television, but he is probably best known as the bumbling cop Lt. Frank Drebin in the "Naked Gun" spoofs."