ETYMOLOGY
? from bunger (? for bungler) + -ly
EXAMPLE (for adj.)
“… I saw her conferring with no worseman then Master Snagge. The bungerliest vearses they were that euer were scande, beeing most of them bought and cut off by the knees out of Virgill, and other Authors. …”
From: Haue vvith you to Saffron-vvalden. Or, Gabriell Harueys hunt is vp.
By Thomas Nashe, 1596
Lexicophilia 