Sunk and Unmitigable

Sunk adjective - Facing certain defeat, disaster, or death.

Unmitigable and sunk are semantically related In some cases you can use "Unmitigable" instead an adjective "Sunk".

Unmitigable adjective - Incapable of being mitigated.

Sunk and unmitigable are semantically related in hopeless topic. Sometimes you can use "Sunk" instead an adjective "Unmitigable", if it concerns topics such as futile.