Definition & Meaning of "dimwit"in English

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

"Dimwit" is an English slang term that appeared in the early 20th century, around the 1920s–1930s. It combines "dim," meaning faint or weak, with "wit," referring to intelligence, to describe someone with little mental sharpness or common sense. The term is used in informal speech to criticize or mock a person's stupidity or poor judgment. It is mildly derogatory but not vulgar, making it socially acceptable in most casual contexts, often with a teasing or humorous tone rather than serious hostility.