<p><strong>Adjective</strong></p><ul><li>liable or subject to change or alteration.</li><li>given to changing; constantly changing; fickle or inconstant: the mutable ways of fortune.</li><li>Synonyms: variable, changeable, unsteady, unsettled, vacillating, unstable.</li><li>Antonyms: stable.</li><li>Computers: (in object-oriented programming) of or noting an object having properties whose values can change while the object itself maintains a unique identity.</li></ul>