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adj. un·sta·bler, un·sta·blest
a. Tending strongly to change: unstable weather.
b. Not constant; fluctuating: unstable vital signs.
a. Wavering or fickle: At first, he was unstable in his decisions.
b. Showing or marked by erratic or volatile emotions or behavior.
3. Not firmly placed; unsteady: an unstable ladder.
a. Decomposing readily.
b. Highly or violently reactive.
a. Decaying with relatively short lifetime. Used of subatomic particles.
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|Noun||1.||unstableness - the quality or attribute of being unstable and irresolute|
unsteadiness - the quality of being unsteady--varying and unpredictable
shakiness - the quality of being unstable and insecure; "the shakiness of the present regime"