ETYMOLOGY
from Latin imperdibilis; from im- + perdere (to lose) + -ibilis (-ible)
EXAMPLE
“… Most men are erroneous in the apprehension of their Felicity, Honour, Glory and Riches being their ordinary objects, are but smoaky substances to make it solid and imperdible; all these are daily subject to casualties: for what with difficulty we have acquired in a year, may by an unexpected accident of fortune be lost in a day, and often times by the same means, we projected to mount the throne of our felicity, we inevitably fall into the abiss of disgrace. …”
From: The Idea of the Lavv Charactered from Moses to King Charles.: Whereunto is added the Idea of Government and Tyranny
By John Heydon, 1660
Lexicophilia 