that which can not be moved; something which is immovable
steadfast in purpose or intention; unalterable, unyielding
not capable of being affected or moved in feeling; impassive
not liable to be removed; permanent in place or tenure; fixed
incapable of being physically moved; fixed
Any similar expression used to prevent giving away one's motives, feelings, or situation.
An impassive facial expression cultivated to prevent other players from determining whether one's actions in the game are the result of a quality hand, or of bluffing.