[adj] subject to change; variable; "a fluid situation fraught with uncertainty"; "everything was unstable following the coup"
[adj] affording no ease or reassurance; "a precarious truce"
[adj] highly or violently reactive; "sensitive and highly unstable compounds"
[adj] disposed to psychological variability; "his rather unstable religious convictions"
[adj] suffering from severe mental illness; "of unsound mind"
[adj] lacking stability or fixity or firmness; "unstable political conditions"; "the tower proved to be unstable in the high wind"; "an unstable world economy"
changeable, changeful, coseismal, coseismic, crank, cranky, disturbed, explosive, fluid, insane, irresolute, labile, mentally ill, precarious, reactive, rickety, rocky, seismal, seismic, shaky, tender, thermolabile, tippy, top-heavy, tottering, uneasy, un