Definition - unstable

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  1. subject to change; variable; "a fluid situation fraught with uncertainty"; "everything was unstable following the coup"
  2. affording no ease or reassurance; "a precarious truce"
  3. highly or violently reactive; "sensitive and highly unstable compounds"
  4. disposed to psychological variability; "his rather unstable religious convictions"
  5. suffering from severe mental illness; "of unsound mind"
  6. lacking stability or fixity or firmness; "unstable political conditions"; "the tower proved to be unstable in the high wind"; "an unstable world economy"