Definition of perdurable:
imperishable, persistent, continuing, undestroyable, old, permanent, lasting, abiding, perpetual, long-lasting, continue, long-wearing, stable, long-lived, long-standing, perennial, permanent, enduring, enduring, indestructible, durable.
It would be an instance of perdurable fidelity, worthy of being placed beside those recorded in one of the Squire's favourite tomes, commemorating the constancy of the olden times; in which times, we are told, " Men and wymmen coulde love togyders seven yeres, and no licours lustes were betwene them, and thenne was love, trouthe, and feythfulnes; and lo in lyke wyse was used love in King Arthur's dayes."- "Bracebridge Hall, or The Humorists", Washington Irving.
Now, though the Japanese are not a destructive people, their paper does not last for ever, and that material has clearly suggested to them a different condition of ornament from that with which they adorned old lacquer, fine ivory, or other perdurable things.- "Essays", Alice Meynell.
Was there also something of that perdurable cohesion of class against class; the powerful if often unlovely unity of faction, the shoulder- to- shoulder combination of war; the tribal fanaticism which makes brave men out of unpromising material?- "The Judgment House", Gilbert Parker.