What is the meaning of the word "unstable"?

Definitions:

  1. disposed to psychological variability copy to clipboard adjective
    • Their rather unstable religious convictions were alarming. copy to clipboard
  2. highly or violently reactive copy to clipboard adjective
    • sensitive and highly unstable compounds copy to clipboard
  3. lacking stability or fixity or firmness copy to clipboard adjective
    • unstable political conditions copy to clipboard

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