Very poor or bad in quality. The service at the restaurant was lousy, and we won't be going back.
After camping in the woods, he discovered that his hair was lousy.
Used to express annoyance or dissatisfaction. I can't believe I lost my keys again; this is a lousy situation.
I'm feeling lousy today and might stay home from work.
Abundant or overflowing (with), especially in the phrase "lousy with". The beach was lousy with tourists during the holiday weekend.