The best replacement for unstable is stable angina.

The best alternatives to unstable are rated as following:
★★★★★  stable angina
★★★★★  instable
★★  heavy warp
★★  stable equilibrium
★  stable air
★  stable isotopes
★  stable fracture
★  stable atmosphere
★  stable
★  testing
★  stable atoms
★  stable attribution
  unstable

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