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Webster 1913 Edition

Instable

In-sta′ble

,
Adj.
[L.
instabilis
: cf. F.
instable
. See
In-
not, and
Stable
,
Adj.
, and cf.
Unstable
.]
Not stable; not standing fast or firm; unstable; prone to change or recede from a purpose; mutable; inconstant.

Webster 1828 Edition

Instable

INSTA'BLE

,
Adj.
[L. instabilis.] Inconstant; prone to change or recede from a purpose; mutable; of persons.
1.
Not steady or fixed; changeable; of things.
[Instable and unstable are synonymous, and the latter is more commonly used.]

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