1. in a musty, stuffy, or stale manner; with a stale or unpleasant smell
Usage: often describes an atmosphere or environment
2. in a slovenly, unkempt, or untidy manner
Usage: describes appearance or dress

Examples

• The old library smelled frowzily of dust and aged paper.
• He dressed frowzily, with wrinkled clothes and uncombed hair.
• The basement air hung frowzily after weeks without ventilation.
• She stumbled into the room frowzily, having just woken up.
• The attic was frowzily cluttered with forgotten belongings.