"clumsy workmanship," 1660s, verbal noun from bungle (v.).
bungling adj.
"prone to bungle, clumsy, awkward," 1580s, present-participle adjective from bungle (v.). Related: Bunglingly.
Entries linking to bungling
bungle v.
"to work or act clumsily," 1520s, origin obscure. OED suggests imitative; perhaps a mix of boggle and bumble, or perhaps [Skeat] from a Scandinavian word akin to Swedish bangla "to work ineffectually," Old Swedish bunga "to strike" (related to German Bengel "cudgel," also "rude fellow"). Related: Bungled; bungling.