to bungle or blunder awkwardly; muddle

He somehow bumbled through two years of college.

to stumble or stagger.

to speak in a low, stuttering, halting manner; mumble.

to do (something) clumsily; botch.

an awkward blunder.

verb

stumble , blunder , bungle , flounder , fudge , fumble , limp , shuffle , stagger , burr , buzz , drone , whir , whiz , bobble , botch , bramble , jumble , muffle , veil

noun

burr , buzz , drone , whir , whiz