lost cause

noun

1. a cause that has been defeated or whose defeat is inevitable.

lost cause

noun

1. a cause with no chance of success

Word History and Origins

Origin of lost cause¹

First recorded in 1860–65

Idioms and Phrases

A hopeless undertaking, as in Trying to get him to quit smoking is a lost cause. In the 1860s this expression was widely used to describe the Confederacy. [Mid-1800s] Also see losing battle.