20/08/2026
Know someone with this?
Look at the tip of their thumb. If it is wider than it is long, with a short broad nail and a compressed fleshy pad, they have one of the most misnamed features in palmistry.
Medieval texts called it the Murderer's Thumb.
Old descriptions were stark. People with this thumb were called animalistic, brutish, capable of violence without premeditation. One source described them as dangerous by nature.
Here is what chirology actually says.
The clubbed or potter's thumb, known medically as brachydactyly type D, is caused by an inherited gene that shortens the tip bone of the thumb. It has nothing to do with violence. The vast majority of people who carry it are earthy, sensitive, conscientious, hardworking and loyal. They feel things deeply and they tend to hold those feelings in rather than express them easily.
The medieval reputation comes from the association of thumb tips with willpower. The theory was that a compressed tip blocks the expression of will, building up unexpressed energy that can release unpredictably. There is truth in this. It describes someone who struggles to express what they feel before it builds to a point of overflow. Violence is a very specific outcome of that pattern, and only when confirmed by several other features of the hand.
Like all features in palmistry, this one only tells its full story alongside the rest of the hand. A potter's thumb on a sensitive, fine-skinned hand with long fingers tells a very different story to the same thumb on a hard, coarse, thick-palmed hand with overdeveloped mounts and a Mark of the Tiger. Context is everything.
Save this. It is one of those things you will want to show someone.