Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of instable is as below...

Instableness :: Instableness (n.) Instability; unstableness.

Instable :: Instable (a.) Not stable; not standing fast or firm; unstable; prone to change or recede from a purpose; mutable; inconstant.

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