adjective, lousier, lousiest.
infested with lice.
mean or contemptible: That was a lousy thing to do.
wretchedly bad; miserable: a lousy job; I feel lousy.
lousy with, Slang. well supplied with or filled with, often to excess: Our city is lousy with bad drivers. I wish I were lousy with money like my boss.

1350–1400; Middle English lousi. See louse, -y1

lousily, adverb
lousiness, noun

2a. shabby, nasty, crummy.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
lousy (ˈlaʊzɪ)
adj , lousier, lousiest
1.  slang very mean or unpleasant: a lousy thing to do
2.  slang inferior or bad: this is a lousy film
3.  infested with lice
4.  slang (foll by with)
 a.  provided with an excessive amount (of): he's lousy with money
 b.  full of or teeming with

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

late 14c., lousi, "infested with lice," from louse + -y (2). Figurative use as a generic term of abuse dates from late 14c.; sense of "swarming with" (money, etc.) is Amer.Eng. slang from 1843.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
If you have great publications but lousy teaching, you'll still get tenure.
In fact, if you really want to understand what it means to be alive, humans are
  a lousy choice.
If you've got lousy credit, be careful where you buy your car.
It's no secret that this is a lousy time to try to sell your business.
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