BUMBLE
bumble, stutter, stammer, falter
(verb) speak haltingly; “The speaker faltered when he saw his opponent enter the room”
stumble, falter, bumble
(verb) walk unsteadily; “The drunk man stumbled about”
botch, bodge, bumble, fumble, botch up, muff, blow, flub, screw up, ball up, spoil, muck up, bungle, fluff, bollix, bollix up, bollocks, bollocks up, bobble, mishandle, louse up, foul up, mess up, fuck up
(verb) make a mess of, destroy or ruin; “I botched the dinner and we had to eat out”; “the pianist screwed up the difficult passage in the second movement”
Source: WordNet® 3.1
Etymology 1
Noun
bumble (plural bumbles)
A confusion; a jumble.
Verb
bumble (third-person singular simple present bumbles, present participle bumbling, simple past and past participle bumbled)
To act in an inept, clumsy or inexpert manner; to make mistakes.
Etymology 2
Verb
bumble (third-person singular simple present bumbles, present participle bumbling, simple past and past participle bumbled)
(intransitive) To boom, as a bittern; to buzz, as a fly.
Noun
bumble (plural bumbles)
A bumble-bee.
(UK, dialect) The bittern.
Source: Wiktionary
Bum"ble, n. Etym: [See Bump to boom.] (Zoöl.)
Definition: The bittern. [Local, Eng.]
Bum"ble, v. i.
Definition: To make a hollow or humming noise, like that of a bumblebee; to
cry as a bittern.
As a bittern bumbleth in the mire. Chaucer.
Source: Webster’s Unabridged Dictionary 1913 Edition