Emily Dickinson Lexicon

MU'TA-BLE, a. [It. mutabile; L. mutabilis, from muto, to change, W. mudaw. See Mew.]

1. Subject to change; changeable; that may be altered form, qualities or nature. Almost every thing we see on earth is mutable; substances are mutable in their form, and we all know by sad experience how mutable are the conditions of life.
2. Inconstant; unsettled; unstable; susceptible of change. Our opinions and our purposes are mutable.