adj. lous·i·er, lous·i·est
1. Inferior or worthless: a lousy play.
2. Extremely contemptible; nasty: a lousy trick.
3. Sick or unwell: I feel really lousy.
4. Infested with lice.
5. Slang Abundantly supplied: lousy with money.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2019 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.