thick
The German word 'dick' is used to describe something that has a significant width or depth in comparison to its length. It can be used to describe objects, such as a 'dickes Buch' (thick book), or people, such as a 'dicker Mann' (a thick or stout man). It can also be used metaphorically to describe a situation or conversation that is complex or difficult to understand, such as a 'dickes Problem' (a thick or complicated problem).
The book is thick.
This phrase is used to describe that a certain book has many pages or is physically thick.
The soup is thick.
This phrase can be used when referring to a soup that has been cooked to the point where it has achieved a high degree of viscosity or thickness.
He is a stubborn man.
The term 'dickköpfig' is a compound adjective made of 'dick' and 'Kopf' which literally translates to 'thick head'. In context, it is used to indicate that someone is stubborn.