mod. rotten; poor; bad. : This mushy stuff is lousy. Do I have to eat it?
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Medical Dictionary
Main Entry: lousy Pronunciation: 'lau-zE Function: adjective Inflected Forms: lous·i·er; -est : infested with lice