Definitions

1. adjective

likely to change or be affected in a sudden or unpredictable way

“The economy was described as unstable due to recent market fluctuations.”

2. adjective

not firmly fixed or in place

“The unstable scaffolding threatened to collapse at any moment.”

3. noun

a person or thing that is not firmly fixed or in place

“The unstable element of the team made it difficult to coordinate their efforts.”