In‐sta″ble (?), a. [L. instabilis: cf. F. instable. See In- not, and Stable, a., and cf. Unstable.] Not stable; not standing fast or firm; unstable; prone to change or recede from a purpose; mutable; inconstant.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.