not stable; unstable.

1375–1425; late Middle English < Latin instabilis. See in-3, stable2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
instable (ɪnˈsteɪbəl)
a less common word for unstable

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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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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