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Dictionary definition for: Unstable
1. (a) lacking stability or fixity or firmness; "unstable political conditions" "the tower proved to be unstable in the high wind" "an unstable world economy"
2. (s) highly or violently reactive; "sensitive and highly unstable compounds"
3. (s) affording no ease or reassurance; "a precarious truce"
4. (s) suffering from severe mental illness; "of unsound mind"
5. (s) disposed to psychological variability; "his rather unstable religious convictions"
6. (s) subject to change; variable; "a fluid situation fraught with uncertainty" "everything was unstable following the coup"
WordNet 2.1 Copyright Princeton University. All rights reserved.