Usage Note
Insumergible is a formal or literary adjective describing something (a vessel, a material) incapable of sinking. It became culturally famous through the ironic claim about the Titanic (el Titanic era supuestamente insumergible). Figuratively it can describe a person or institution that seems impossible to bring down. It has a single form for both masculine and feminine (barco insumergible / nave insumergible).
Examples
"Pensaban que el barco era insumergible."
Natural Translation
They thought the ship was unsinkable.
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