a. 易变的, 性情不定的

[ adj ]
capable of or tending to change in form or quality or nature
<adj.all>
a mutable substancethe mutable ways of fortune
mutable weather patterns
a mutable foreign policy

Mutable \Mu"ta*ble\, a. [L. mutabilis, fr. mutare to change. See
{Move}.]
1. Capable of alteration; subject to change; changeable in
form, qualities, or nature.

Things of the most accidental and mutable nature.
--South.

2. Changeable; inconstant; unsettled; unstable; fickle.
``Most mutable wishes.'' --Byron.

Syn: Changeable; alterable; unstable; unsteady; unsettled;
wavering; inconstant; variable; fickle.