1. blind alley - Noun
2. blind alley - Phrase
a street with only one way in or out
(figurative) a course of action that is unproductive and offers no hope of improvement
Source: WordNetblind-alley
Do not keep saying to yourself, if you can possibly avoid it, "But how can it be like that?" because you will get "down the drain", into a blind alley from which nobody has yet escaped. Nobody knows how it can be like that. Richard Feynman
A man who has blown all his options can't afford the luxury of changing his ways. He has to capitalize on whatever he has left, and he can't afford to admit - no matter how often he's reminded of it - that every day of his life takes him farther and farther down a blind alley. Hunter S. Thompson
Practised for centuries, repression has so badly succeeded that it has but led us into a blind alley from which we can only issue by carrying torch and hatchet into the institutions of our authoritarian past. Peter Kropotkin
The central government possesses no plan of finding the way out of this blind alley. Aleksandr Solzhenitsyn
all the clues led the police into blind alleys Source: Internet
so far every road that we've been down has turned out to be a blind alley Source: Internet