blind alley

noun

1. a road, alley, etc., that is open at only one end.

2. a position or situation offering no hope of progress or improvement.

   That line of reasoning will only lead you up another blind alley.

blind alley

noun

1. an alley open at one end only; cul-de-sac

2. informal,  a situation in which no further progress can be made

Word History and Origins

Origin of blind alley¹

First recorded in 1575–85

Idioms and Phrases

A dead end; a position without hope of progress or success. For example, That line of questioning led the attorney up yet another blind alley. This term alludes to a street or alley that has no outlet at one end. [Mid-1800s]