From WordNet (r) 3.0 (2006):
changeable
adj 1: capable of or tending to change in form or quality or
nature; "a mutable substance"; "the mutable ways of
fortune"; "mutable weather patterns"; "a mutable foreign
policy" [syn: mutable, changeable] [ant:
changeless, immutable]
2: such that alteration is possible; having a marked tendency to
change; "changeable behavior"; "changeable moods";
"changeable prices" [syn: changeable, changeful] [ant:
unchangeable]
3: subject to change; "a changeable climate"; "the weather is
uncertain"; "unsettled weather with rain and hail and
sunshine coming one right after the other" [syn:
changeable, uncertain, unsettled]
4: varying in color when seen in different lights or from
different angles; "changeable taffeta"; "chatoyant (or shot)
silk"; "a dragonfly hovered, vibrating and iridescent" [syn:
changeable, chatoyant, iridescent, shot]