Ĭn'sta-bĭl'i-ty, n.

n. [Fr. instabilité, Sp. instabilidad, It. instabilità, Lat. instabilitas.] The quality or condition of being unstable; want of stability; want of firmness in purpose; inconstancy; fickleness; mutability; as, the instability of laws, plans, or measures. “Instability of temper.” Addison.

Synonyms—Inconstancy; fickleness; changeableness; wavering; unsteadiness; unstableness.