Pinhead and Slow-witted

Pinhead noun - A stupid person.

Slow-witted and pinhead are semantically related. In some cases you can use "Slow-witted" instead an adjective "Pinhead".

Slow-witted adjective - Not having or showing an ability to absorb ideas readily.

Pinhead and slow-witted are semantically related. Sometimes you can use "Pinhead" instead an adjective phrase "Slow-witted".