in·de·fec·ti·ble /-ˈfɛktəbəl/
  (a.)不敗的,不易壞的,無瑕的
  In·de·fect·i·ble a.  Not defectible; unfailing; not liable to defect, failure, or decay.
     An indefectible treasure in the heavens.   --Barrow.
     A state of indefectible virtue and happiness.   --S. Clarke.
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