FLUIDNESS
fluidity, fluidness
(noun) a changeable quality; “a charming Oriental fluidity of manner”; “a certain fluidness in his perception of time made him an unpredictable colleague”; “demographers try to predict social fluidity”
fluidity, fluidness, liquidity, liquidness, runniness
(noun) the property of flowing easily; “adding lead makes the alloy easier to cast because the melting point is reduced and the fluidity is increased”; “they believe that fluidity increases as the water gets warmer”
Source: WordNet® 3.1
Etymology
Noun
fluidness (uncountable)
The quality of being fluid.
Source: Wiktionary
Flu"id*ness, n.
Definition: The state of being flluid; fluidity.
Source: Webster’s Unabridged Dictionary 1913 Edition