It's a lost cause

Origin

The phrase "a lost cause" has roots stretching back to the 17th century, where "cause" referred not just to a reason, but to a collective aim or struggle, often political or military. When such a struggle was definitively defeated or abandoned, it became "lost." Its enduring power, however, truly solidified in the aftermath of the American Civil War in the 19th century. There, "The Lost Cause of the Confederacy" emerged as a powerful, romanticized narrative explaining the South's defeat and preserving its ideology. This historical context cemented the phrase's meaning, linking it to any endeavor that is irrevocably doomed, whether a grand political movement or a personal, hopeless effort.