01 a. Capable of alteration; subject to change; changeable in form, qualities, or nature.
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1.
Capable of alteration; subject to change; changeable in form, qualities, or nature.“Things of the most accidental and mutable nature.” — South.
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2.
Changeable; inconstant; unsettled; unstable; fickle.
Syn.
Changeable; alterable; unstable; unsteady; unsettled; wavering; inconstant; variable; fickle.