v. ad·dled, ad·dling, ad·dles
To cause (someone) to think unclearly; confuse: "My brain is a bit addled by whiskey" (Eugene O'Neill). See Synonyms at befuddle.
1. To become confused.
2. To become rotten, as an egg.
[From Middle English adel, rotten, from Old English adel, pool of excrement.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 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.