undestroyable

Within this impenetrable waste of rank, stinking seaweed, in places many feet deep, are collected wreckages of all ages and all climes, grim and permanent records of the world's maritime history, unsinkable and undestroyable.

Long, long with blistered feet we wandered in That land of ruins, through whose sky of brass Hate's Harpy shrieked; and in whose iron grass The Hydra hissed of undestroyable Sin.

Only soundness and loveliness of nature, inborn, undestroyable, could have withstood such luxury, indulgence, surfeit as she had always known.

"Most chymists think glass a body more undestroyable than gold itself."—BOYLE: ib.