The Collaborative International Dictionary of English v.0.48:
Changeful \Change"ful\, a. Full of change; mutable; inconstant; fickle; uncertain. --Pope. [1913 Webster] His course had been changeful. --Motley. -- Change"ful*ly, adv. -- Change"ful*ness, n. [1913 Webster]WordNet (r) 3.0 (2006):
changefulness n 1: the quality of being changeable and variable [syn: inconstancy, changefulness] [ant: constancy, stability]