"Blockhead" is a term often used to describe someone who is perceived as foolish or slow to understand. It can also refer to a person who stubbornly refuses to change their opinion or behavior, despite evidence or reasoning to the contrary. The term is informal and can be used humorously or derogatorily, depending on the context. In popular culture, "Blockhead" is also the name of a character from the animated series Peanuts, created by Charles M. Schulz. This character, known for his simple-mindedness, often finds himself in humorous situations, highlighting the charm and innocence of being a "blockhead."