A continuous, amorphous substance whose molecules move freely past one another and that has the tendency to assume the shape of its container; a liquid or gas.
Of, relating to, or characteristic of a fluid.
Readily reshaped; pliable.
Smooth and flowing; graceful: the fluid motion of a cat.
Changing or tending to change; variable: a fluid situation fraught with uncertainty.
Characterized by or allowing social mobility: a fluid society.