Fluid

1. (not comparable) Of or relating to fluid.
2. In a state of flux; subject to change.
3. Moving smoothly, or giving the impression of a liquid in motion.
4. (of an asset) Convertible into cash.
5. (rare) Genderfluid.

(of or relating to fluid): fluidical, liquid; fluidic

(subject to change): unstable, variable; changeable

(moving smoothly): fluent, fluxive; runny