addle

 
Pronunciation: /ˈad(ə)l/

verb

  • 1 [with object] chiefly humorous make (someone) unable to think clearly; confuse: being in love must have addled your brain
  • 2 [no object] (of an egg) become rotten, producing no chick.

adjective

  • 1 [in combination] not clear or cogent; muddled: the film is addle-brained
  • 2 archaic (of an egg) rotten.

Origin:

Middle English (in addle (sense 2 of the adjective)): from Old English adela 'liquid filth', of Germanic origin; related to Dutch aal and German Adel 'mire, puddle'