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

[ Syn: precarious ]

suffering from severe mental illness; of unsound mind

[ Syn: mentally ill , unsound ]

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

[ Syn: fluid ]