Adjective
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varying in color when seen in different lights or from different angles
"changeable taffeta"
"chatoyant (or shot) silk"
"a dragonfly hovered, vibrating and iridescent"
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subject to change
"a changeable climate"
"the weather is uncertain"
"unsettled weather with rain and hail and sunshine coming one right after the other"
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such that alteration is possible
having a marked tendency to change
"changeable behavior"
"changeable moods"
"changeable prices"
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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"