CHANGEFUL
changeable, changeful
(adjective) such that alteration is possible; having a marked tendency to change; “changeable behavior”; “changeable moods”; “changeable prices”
Source: WordNet® 3.1
Etymology
Adjective
changeful (comparative more changeful, superlative most changeful)
(rare) Changing frequently; very susceptible to change
Synonyms: variable, fickle
Source: Wiktionary
Change"ful, a.
Definition: Full of change; mutable; inconstant; fickle; uncertain. Pope.
His course had been changeful. Motley.
– Change"ful*ly, adv.
– Change"ful*ness, n.
Source: Webster’s Unabridged Dictionary 1913 Edition