Definition & Meaning of "addle pate"in English

What is the origin of the term "addle pate" and how is it used?

"Addle pate" is an English expression dating back to at least the 16th–17th centuries, combining "addle" (meaning spoiled, rotten, or confused, originally used for eggs) with "pate" (an old word for head) to describe someone whose thinking is muddled or foolish. The term evokes the image of a brain that has gone "bad" or is incapable of clear thought. It has been used in literature, informal speech, and gentle insults to label a confused or stupid person. The phrase is mildly derogatory, generally playful rather than harsh, and rarely considered seriously offensive.