不ふ沈ちん

noun which may take the genitive case particle 'no'

unsinkable

Describes a ship or vessel that cannot be sunk. Often used in historical or technical contexts, such as the 'unsinkable' Titanic.

• タイタニック号ごうは不ふ沈ちんの船ふねと言いわれていた。

  The Titanic was said to be an unsinkable ship.