"unstable" in the adjective sense
1. unstable
lacking stability or fixity or firmness
"unstable political conditions"
"the tower proved to be unstable in the high wind"
"an unstable world economy"
2. unstable
highly or violently reactive
"sensitive and highly unstable compounds"
3. precarious, unstable
affording no ease or reassurance
"a precarious truce"
4. mentally ill, unsound, unstable
suffering from severe mental illness
"of unsound mind"
5. unstable
disposed to psychological variability
"his rather unstable religious convictions"
6. fluid, unstable
subject to change variable
"a fluid situation fraught with uncertainty"
"everything was unstable following the coup"
Source: WordNet® (An amazing lexical database of English)
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