[in-stey-buh l]


not stable; unstable.

Origin of instable

First recorded in 1375–1425; late Middle English word from Latin word instabilis. See in-3, stable2 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for instable

Historical Examples of instable

British Dictionary definitions for instable



a less common word for unstable
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for instable

c.1400, from Latin instabilis, from in- "not, opposite of" (see in- (1)) + stabilis (see stable). Now mostly replaced by unstable.

Online Etymology Dictionary, © 2010 Douglas Harper