Definition & Meaning of "braindead"in English

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

"Braindead" is an English slang term that appeared in the mid-20th century, originally in medical contexts to describe the irreversible loss of brain function. By the late 20th century, it was adopted figuratively to describe someone or something that is extremely stupid. The term is used in informal speech, media, and online discussions. It is derogatory, often harsh, and conveys strong contempt, though it can also be used humorously in exaggeration.