Meaning of unstable in English
1. easily moved or shaken, not firmly fixed; shaky
This chair is unstable.
2. likely to change suddenly and unpredictably, especially for the worse; unpredictable or irregular
The recent weather is unstable.
It's true that my income was unstable.
3. dangerous and likely to fall over; precarious
The old man was still a bit unstable on his foot. ー He staggered to his feet, swaying a little.
4. showing or characterized by rapid changes of emotions or behavior because you are nervous or not confident; lacking mental balance
I am extremely unstable.