1.
You can describe something as ~ if it is likely to change suddenly, especially if this creates difficulty or danger.
After the fall of Pitt in 1801 there was a decade of ~ government...
The situation is ~ and potentially dangerous.
? stable
ADJ
2.
Unstable objects are likely to move or fall.
Both clay and sandstone are ~ rock formations.
? stable
ADJ
3.
If people are ~, their emotions and behaviour keep changing because their minds are disturbed or upset.
He was emotionally ~...
? stable
ADJ