D defs.my
Entry 2 senses Webster, 1913

Instability

/ĭnˌ-stəb-ĭl'-ĭt-ē/ · In·sta·bil·i·ty · IPA /ˌɪnstəbˈɪlɪtiː/
01 n. The quality or condition of being unstable; lack of stability, firmness, or steadiness; liability to give way or to fail; insecurity; preca…
pl. Instabilities ((#))
  1. 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.
  2. 2.
    Lack of determination of fixedness; inconstancy; fickleness; mutability; changeableness; as, instability of character, temper, custom, etc.