Source : Webster's Revised Unabridged Dictionary (1913)

Addle \Ad"dle\, v. t. & i. [imp. & p. p. {Addled}; p. pr. & vb.
   n. {Addling}.]
   To make addle; to grow addle; to muddle; as, he addled his
   brain. ``Their eggs were addled.'' --Cowper.

Source : WordNet®

addled
     adj 1: (of eggs) no longer edible; "an addled egg"
     2: confused and vague; used especially of thinking;
        "muddleheaded ideas"; "your addled little brain"; "woolly
        thinking"; "woolly-headed ideas" [syn: {befuddled}, {muddled},
         {muzzy}, {woolly}, {wooly}, {woolly-headed}, {wooly-minded}]