n.; pl.Instabilities [ L. instabilitas: cf. F. instabilité. ] [ 1913 Webster ]
1. The quality or condition of being unstable; lack of stability, firmness, or steadiness; liability to give way or to fail; insecurity; precariousness; as, the instability of a building. [ 1913 Webster ]
2. Lack of determination of fixedness; inconstancy; fickleness; mutability; changeableness; as, instability of character, temper, custom, etc. Addison.