WordNet sense 1 (characteristic of a fluid; capable of flowing and easily changing shape):

runny

WordNet sense 2 (existing as or having characteristics of a liquid; especially tending to flow):

liquid

WordNet sense 3 (smooth and unconstrained in movement):

fluent, smooth

WordNet sense 4 (characterized by beauty of movement, style, form, or execution):

graceful

WordNet sense 5 (free or available for use or disposition):

disposable

WordNet sense 6 (affording change (especially in social status)):

mobile, mobile

WordNet sense 7 (subject to change; variable):

unstable

WordNet sense 8 (such that alteration is possible; having a marked tendency to change):

changeful