unstable meaning and definition

UNSTABLE adjective

Definition of unstable (adjective)

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