1 - messy or shabby in personal appearance or manner of dress
2 - In North America. unpleasant to be in because of mustiness, staleness, or a bad smell
The origin is unknown, but the first known use is from 1681.
For the sake of their image, the band members transformed themselves from clean-cut lads to frowzy rockers.
Joe's house was unlivable after the flood due to its frowzy smell.