Hieratic

Hieratic means priestly; associated with the priesthood or priests.

It can also refer to a cursive form of ancient Egyptian writing (used especially by the priests ).

A third meaning is 'adhering to fixed types or methods; highly restrained and formal'.

It comes from the Greek word meaning "sacred" .

“It gave him a look, hieratic, distinguished, and alien but he wore it unselfconsciously....” P D James