unstable
Definitions
Prone to unpredictable changes, fluctuations, or collapse.
Lacking emotional or mental stability; volatile.
Not firmly fixed or supported; liable to fall or sway.
Examples
The patient's condition remained unstable throughout the night.
Do not climb that ladder because it looks very unstable.
The political situation in the region is highly unstable.
Synonyms
volatile unsteady precarious fluctuating fickle insecure erratic