un·sta·ble /-ˈstebəl/
 (a.)不穩定的
 un·sta·ble /-ˈstebəl/ 形容詞
 不穩定的,易變的
 unstable
 不穩定
 Un·sta·ble a.  Not stable; not firm, fixed, or constant; subject to change or overthrow. -- Un*sta*ble*ness, n. --Chaucer.
 Unstable equilibrium. See Stable equilibrium, under Stable.
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 unstable
      adj 1: lacking stability or fixity or firmness; "unstable political
             conditions"; "the tower proved to be unstable in the
             high wind"; "an unstable world economy" [ant: stable]
      2: highly or violently reactive; "sensitive and highly unstable
         compounds"
      3: affording no ease or reassurance; "a precarious truce" [syn:
          precarious]
      4: suffering from severe mental illness; "of unsound mind"
         [syn: 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"
         [syn: fluid]