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instable
From The Collaborative International Dictionary of English v.0.48:
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. [1913 Webster]
