flyblown
adjective
fly·blown ˈflī-ˌblōn 
1
a
: not pure : tainted
a world flyblown with the vices of irresponsible power
V. L. Parrington
V. L. Parrington b
: not bright and new : seedy, moth-eaten
c
: trite, hackneyed
a long list of flyblown metaphors Horizon
Horizon2
a
: infested with eggs or young larvae of a flesh fly or blowfly
b
: covered with flyspecks
Did you know?
One meaning of blow (used mostly, it seems, by 17th century entomologists) is "to deposit eggs or larvae on"-hence the blowfly, which lays its eggs on meat or wounds. Flyblown has its origins in the very unpleasant image of a blowfly's victim, and it's from this literal meaning that the more common senses come. Phrases such as flyblown shack and flyblown restaurant still suggest the actual presence of flies, if not necessarily their embryonic precursors.
Word History
First Known Use
1528, in the meaning defined at sense 1a
Medical Definition
flyblown
adjective
fly·blown -ˌblōn
1
: infested with flyblows
2
: covered with flyspecks