unstable

adjective

1. lacking stability or fixity or firmness"unstable political conditions"
2. highly or violently reactive"sensitive and highly unstable compounds"
3. affording no ease or reassurance"a precarious truce"
4. suffering from severe mental illness"of unsound mind"
5. disposed to psychological variability"his rather unstable religious convictions"
6. subject to change; variable"a fluid situation fraught with uncertainty"