is the Old English adela (filth), hence rotten, putrid, worthless. A worthless egg. An egg which has not the vital principle. Addle-headed, addle-pate, empty headedAs an addle-egg produces no living bird, so an addle-pate lack brains. (The) Addle Parliament (The)5th April to 7th June, 1614. So called because it did not pass one single measure. (See Parliament.)