mūtābĭlĭtas, ātis, f. [mutabilis],
changeabieness, mutability (class.; syn.: mobilitas, inconstantia, levitas): mentis, * Cic. Tusc. 4, 35, 76; Mart. Cap. 8, § 871.
mūtābilitās ātis, f mutabilis, changeableness, mutability : mentis. ...
An Elementary Latin Dictionary