Hypertext Webster Gateway: "Instable"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Instable \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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