unsinkable adjective 2noun 1forms 3 adjective2 •That cannot be sunk.Any true Grecophile will understand when I say that the unsinkable condom and the smell of shit which precede the moment of illumination make it more exciting when it happens. — 1981 •(figurative) That cannot be overcome or defeated. noun1 •A ship that was designed to be unsinkable.As the construction and preparation of the unsinkables would require six weeks or two months , I thought it best to make report of my plan to the admiral before the departure from Key West . — 1898 formsunsinkables · more unsinkable · most unsinkable