The Collaborative International Dictionary of English v.0.48:
Changeableness \Change"a*ble*ness\, n. The quality of being changeable; fickleness; inconstancy; mutability. [1913 Webster]WordNet (r) 3.0 (2006):
changeableness n 1: the quality of being changeable; having a marked tendency to change; "the changeableness of the weather" [syn: changeableness, changeability] [ant: changelessness, unchangeability, unchangeableness, unchangingness]