Blind Alley is a term used to describe a situation that has no solution or progress. It is often used to refer to a dead-end street, an IMPASSE, or a cul-de-sac. An IMPASSE is a situation in which no progress can be made due to opposing views or lack of agreement. A dead-end is a street with only one entrance and exit, leading to a dead-end. A cul-de-sac is a street with only one entrance and exit, but it is usually curved and does not lead to a dead-end. All three terms, IMPASSE, dead-end, and cul-de-sac, are synonyms for the term blind alley.