in·vin·ci·ble /(ˌ)ɪnˈvɪn(t)səbəl/
  (a.)不能征服的,無敵的
  In·vin·ci·ble a.  Incapable of being conquered, overcome, or subdued; unconquerable; insuperable; as, an invincible army, or obstacle.
  Lead forth to battle these my sons
  Invincible.   --Milton.
  -- In*vin*ci*ble*ness, n. -- In*vin*ci*bly, adv.
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  invincible
       adj : incapable of being overcome or subdued; "an invincible
             army"; "her invincible spirit" [syn: unbeatable, unvanquishable]