changeable (adj.)

mid-13c., "unstable, inconstant, unreliable," from Old French changeable "inconstant," from changier "to alter; exchange; to switch" (see change (v.)) + -able (see -able). Meaning "subject to variation" is from late 14c. Related: Changeably; changeability.

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Definitions of changeable from WordNet

changeable (adj.)
capable of or tending to change in form or quality or nature;
Synonyms: mutable
changeable (adj.)
such that alteration is possible; having a marked tendency to change;
changeable moods
changeable prices
changeable behavior
Synonyms: changeful
changeable (adj.)
subject to change;
a changeable climate
Synonyms: uncertain / unsettled
changeable (adj.)
varying in color when seen in different lights or from different angles;
changeable taffeta
Synonyms: chatoyant / iridescent / shot