D defs.my
Entry 2 senses Webster, 1913

Mutable

/myo͞ot'-əb-əl/ · Mu·ta·ble · IPA /ˈmjuːtəbəl/
01 a. Capable of alteration; subject to change; changeable in form, qualities, or nature.
  1. 1.
    Capable of alteration; subject to change; changeable in form, qualities, or nature.
    “Things of the most accidental and mutable nature.” South.
  2. 2.
    Changeable; inconstant; unsettled; unstable; fickle.