verb (used with object), verb (used without object), addled, addling.
to make or become confused.
to make or become rotten, as eggs.
mentally confused; muddled.
rotten: addle eggs.

before 1000; Middle English adel rotten, Old English adela liquid, filth; cognate with Middle Low German adele liquid manure

unaddled, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
addle1 (ˈædəl)
1.  to make or become confused or muddled
2.  to make or become rotten
3.  (in combination) indicating a confused or muddled state: addle-brained; addle-pated
[C18: (vb), back formation from addled, from c13 addle rotten, from Old English adela filth; related to dialect German Addel liquid manure]

addle2 (ˈædəl)
dialect (Northern English) to earn (money or one's living)
[C13: addlen, from Old Norse öthlask to gain possession of property, from ōthal property]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1712, from addle (n.) "urine, liquid filth," from O.E. adela "mud, mire, liquid manure" (cognate with O.Swed. adel "urine," M.L.G. adel, Du. aal "puddle"). Used in noun phrase addle egg (mid-13c.) "egg that does not hatch, rotten egg," lit. "urine egg," a loan-transl. of L. ovum urinum, which is itself
an erroneous loan-transl. of Gk. ourion oon "putrid egg," lit. "wind egg," from ourios "of the wind" (confused by Roman writers with ourios "of urine," from ouron "urine"). Because of this usage, the noun in Eng. was taken as an adj. from c.1600, meaning "putrid," and thence given a fig. extension to "empty, vain, idle," also "confused, muddled, unsound" (1706). The verb followed.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
On some accounts, it has simply addled their brains, destroying their powers of
  concentration forever by dint of distraction.
Or, it might bounce off the students social-networking addled minds.
Burglars are generally drug-addled, unskilled and opportunistic.
Too often, models were showing up to photo-shoots hours late or drug-addled.
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