shifting

Refers to sand dunes that are constantly changed by the wind; also used metaphorically for something unreliable.

Often used in the context of power, influence, or opinion (e.g., shifting balance of power).

Refers to the changing direction of the sea tide; often used metaphorically for changing opinions or circumstances.

Refers to alliances, especially political or military, that are not stable and change over time.

Used to describe a change in loyalty, often in a political or personal context.