FUG

noun

1. A heavy, musty, and unpleasant atmosphere, usually in a poorly-ventilated area.
2. A state of lethargy and confusion; daze.
3. A state of chaos or confusion.

verb

1. To create a fug (heavy unpleasant atmosphere).
2. To be surrounded by a fug (heavy unpleasant atmosphere).
3. To put into a fug (daze).