Unsinkable

a. (UN-¹ 7 b.)

  Also, in recent use (1912), unsinkableness.

1655.  Mrq. Worcester, Cent. Inv., Index p. ij. An unsinkable Ship.

1853.  Lond. Jrnl., 17 Dec., 254/1. The cork hat will certainly have some practical advantages. Its lightness is one, and its unsinkableness in water will be another; but we doubt whether it would be proof against those bricks which sometimes get into hats?

1861.  Times, 10 July. Unsinkable Iron Ships.

1883.  Fisheries Exhib. Catal., 62. Unsinkable Suits for Fishermen.

1912.  J. B. Walker (title), An Unsinkable Titanic: Every Ship Its Own Lifeboat.