n. 易变性, 性情不定

[医] 突变性

[ noun ]
the quality of being capable of mutation
<noun.attribute>

Mutability \Mu`ta*bil"i*ty\, n. [L. mutabilitas: cf. F.
mutabilit['e].]
The quality of being mutable, or subject to change or
alteration, either in form, state, or essential character;
susceptibility of change; changeableness; inconstancy;
variation.

Plato confessed that the heavens and the frame of the
world are corporeal, and therefore subject to
mutability. --Stillingfleet.