lousy /ˈlaʊ.zi/ adjective8 •(informal) very bad, or much worse than it should beNo offense, but his cooking is lousy. •(informal) Unwell; under the weather.I caught a cold and I've been feeling lousy all week. •(informal) Unwanted and often unpleasant. •(informal) Insufficient and less than expected of a good thing.I worked here all summer and all I got was this lousy T-shirt. •(informal) Underhanded; mean; contemptible.I've had enough of lousy backstabbing at this place. •(informal) Filled or packed (with something, usually bad).The place was lousy with students. •(informal) Dirty or untidy.I cleaned the lousy garage. •Infested with lice. formslousier · lousiest