unstable

lacking stability or fixity or firmness; "unstable political conditions"; "the tower proved to be unstable in the high wind"; "an unstable world economy"

highly or violently reactive; "sensitive and highly unstable compounds"

affording no ease or reassurance; "a precarious truce"

suffering from severe mental illness; "of unsound mind"

disposed to psychological variability; "his rather unstable religious convictions"

subject to change; variable; "a fluid situation fraught with uncertainty"; "everything was unstable following the coup"