niestały niestabilny v angličtině:

Antimatter is highly unstable.

Oil prices are unstable.

unstable economic situation

He fixed the unstable chair to prevent an accident.

Future prospects for ASEAN seem unstable, no matter how you look at it.

The political situation was, to say the least, extremely unstable during the next ten years of his reign.

Fortune is unstable, while our will is free.