noun.
The state of being unstable; want of stability or firmness, physical or moral; liability to fall, fail, give way, or suffer change.
the GNU version of the Collaborative International Dictionary of English
noun.
The quality or condition of being unstable; lack of stability, firmness, or steadiness; liability to give way or to fail; insecurity; precariousness.
noun.
Lack of determination of fixedness; inconstancy; fickleness; mutability; changeableness