Definition & Meaning of "cretin"in English

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

"Cretin" is an English term that dates back to the 18th century, borrowed from the French crétin, originally used to describe someone with congenital physical deformities or severe mental disability, often linked to iodine deficiency. Over time, especially in informal speech, its meaning shifted metaphorically to describe a person who is stupid, objectionable, or clumsy, without reference to actual medical conditions. The term is used in informal, critical, or mocking contexts and is mildly to moderately derogatory. It is not vulgar but is intended to insult or ridicule someone's behavior or character.