Synonyms for Blind alley:

n.

backyard, close, back, open, arcade, alleyway, campus, alley, cloister, car park. artifact (noun)
cul de sac, impasse, dead-end street.
blind alley (noun)
cul de sac, impasse, dead-end street.
closed-off passage (noun)
impasse, dead-end street.
disappointments (noun)
downer, brave new world, disappointment, false dawn, blow, betrayal, letdown, anticlimax, body blow, shame.

Other synonyms:

alleyway, backyard, campus, alley. disappointment, cloister, arcade. back. close. Other relevant words:
close, alleyway, alley.