INSTABIL'ITY, noun [Latin instabilitas, instabilis; in and stabilis, from sto, to stand. 1. Want of stability; want of firmness in purpose; inconstancy; fickleness; mutability of opinion or conduct. instability is the characteristic of weak minds. 2. Changeableness; mutability; as the instability of laws, plans or measures.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI