instable

American  

[in-stey-buhl] / ɪnˈsteɪ bəl /

adjective

1. not stable; unstable.

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instable British  

/ ɪnˈsteɪbəl /

adjective

1. a less common word for unstable

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Etymology

Origin of instable

First recorded in 1375–1425; late Middle English word from Latin word instabilis. See in- ³, stable ²

Example Sentences

Moreover, the conflict is becoming more drawn out, and even if it subsides there is a risk of an instable resolution where Iranian nuclear material and know-how leaks out to hostile groups around the Gulf.

From MarketWatch • Mar. 10, 2026

But they’re still a little too instable in some areas to pull through and play to the level of their talent.

From Washington Post • May 15, 2017

The distance of the former, and the cautious, unassuming character of its minister here, is one cause of delays: a greater one is, the greediness and instable character of the Emperor.

From Memoir, Correspondence, And Miscellanies, From The Papers Of Thomas Jefferson, Volume 2 by Randolph, Thomas Jefferson

When the most astute critic of American labor conditions has said, 'While immigration continues in great volume, class lines will be forming and reforming, weak and instable.

From An American Idyll The Life of Carleton H. Parker by Parker, Cornelia Stratton

But not many days passed before the instable people discovered how great a loss he was to them.

From Naples Past and Present by Norway, Arthur H.