Source : Webster's Revised Unabridged Dictionary (1913)

Indefectible \In`de*fect"i*ble\, a. [Pref. in- not + defectible:
   cf. F. ind['e]fectible.]
   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.