BUMBLING
bumbling, bungling, butterfingered, ham-fisted, ham-handed, handless, heavy-handed, left-handed
(adjective) lacking physical movement skills, especially with the hands; “a bumbling mechanic”; “a bungling performance”; “ham-handed governmental interference”; “could scarcely empty a scuttle of ashes, so handless was the poor creature”- Mary H. Vorse
Source: WordNet® 3.1
Verb
bumbling
present participle of bumble
Noun
bumbling (plural bumblings)
The act of one who bumbles; a mistake or error, especially through clumsiness.
Adjective
bumbling (comparative more bumbling, superlative most bumbling)
Acting in a confused or ineffectual way; incompetent; showing little or no skill.
Source: Wiktionary
BUMBLE
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