fluid

Any substance which can flow with relative ease, tends to assume the shape of its container, and obeys Bernoulli's principle; a liquid, gas or plasma.

A liquid (as opposed to a solid or gas).

(specifically, typically in the plural) Intravenous fluids.

Of or relating to fluid.

In a state of flux; subject to change.

Moving smoothly, or giving the impression of a liquid in motion.

(of an asset) Convertible into cash.

Genderfluid.