in-stablest

instable

[in-stey-buhl]
adjective
not stable; unstable.

Origin:
1375–1425; late Middle English < Latin instabilis. See in-3, stable2

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World English Dictionary
instable (ɪnˈsteɪbəl)
 
adj
a less common word for unstable

Collins English Dictionary - Complete & Unabridged 10th Edition
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