The Collaborative International Dictionary
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.
Wiktionary
a. Not defectible.
Usage examples of "indefectible".
The glassy black surface of the monolith was as indefectible as any well-crafted mirror.
Hence Gnosis, when once obtained, is indefectible, not like the rapture which Plotinus enjoyed but four times during his acquaintance with Porphyry, which in the experience of Theresa never lasted more than half an hour.
At 0304 hours tomorrow you two in the Indefectible will crack ether headed out Cygnus way.
They did what had to be done and the next morning, at exactly 0304:00 hours, the mighty bulk of the Indefectible hurled itself into space.
One hundred miles above the barren, blasted surface of Biru-2 the good old Indefectible popped into existence.
These coruscating forces blasted into the impregnable screens of the old Indefectible, which, sadly, was destined not to get much older, and instantly punched their way through and splashed coruscatingly from the very hull of the ship itself.