Definition of instability :
1. Lack of determination of fixedness; inconstancy; fickleness; mutability; changeableness; as, instability of character, temper, custom, etc.
2. The quality or condition of being unstable; want of stability, firmness, or steadiness; liability to give way or to fail; insecurity; precariousness; as, the instability of a building.
mutability, combat fatigue, delusion, asymmetry, restlessness, immaturity, bipolar disorder, fluidity, irregularity, fluctuation, mobility, flightiness, variability, wavering, alternation, danger, unsureness, precipice, mental unsoundness, Asperger's syndrome, wobbliness, vacillation, disquiet, delicacy, claustrophobia, volatility, changeability, transience, dementia, pliancy, havoc, change, anxiety, irresolution, inquietude, unsteadiness, autism, threat, vulnerability, crisis, brittleness, imbalance, crack-up, shakiness, emergency, dissymmetry, impermanence, inconsistency, precariousness, insecurity, oscillation, ricketiness, unbalance, breakdown, strong, weakness, escapade, adventure, nonuniformity, fickleness, minefield, flexible, derangement, hesitation, disequilibrium, agoraphobia, uncertainty, fragility, unstableness, insecureness, a disaster waiting to happen, capriciousness, fitfulness
- It was as if the fearful instability of Mr. Ransome's nervous system communicated itself to everybody around him.
- This number of pages was specified, because Prescott dreaded his own instability of purpose, and felt that if he should once get so far as two hundred and fifty pages, he would be certain to go on and finish the entire history. - "William Hickling Prescott", Harry Thurston Peck.
- The wiseacres and learned men, the more wealthy burgesses, and people of more consideration, were content with a few philosophical reflections anent the instability of human nature and the evil influences of Court life and of great wealth. - "The Tangled Skein", Emmuska Orczy, Baroness Orczy.