in·sta·ble

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

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

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instable (ɪnˈsteɪbəl) [Click for IPA pronunciation guide]
 
adj
a less common word for unstable

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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00:10
Instable is always a great word to know.
So is lollapalooza. Does it mean:
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
a fool or simpleton; ninny.
Example sentences
People fear vibrations caused by trains will trigger the instable explosives.
Those currencies are so instable and weak over the speculations system.
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