nonsinkable

adjective
non·sink·able | \ˌnän-ˈsiŋ-kə-bəl \

Definition of nonsinkable 

: incapable of being sunk : unsinkable … whale boats molded of glass and teflon and made nonsinkable by plastic foam in all dead spaces.— Robert A. Heinlein nonsinkable vessels

First Known Use of nonsinkable

1875, in the meaning defined above

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The first known use of nonsinkable was in 1875

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