blind_alley
1. [ noun ] (figurative) a course of action that is unproductive and offers no hope of improvement
Examples:

"all the clues led the police into blind alleys" "so far every road that we've been down has turned out to be a blind alley"

Related terms: course trope
2. [ noun ] (transportation) a street with only one way in or out
Synonyms: dead_end dead-end_street impasse cul_de_sac
Related terms: thoroughfare
Similar spelling:   blind_eel
  blunt_file
  blind_side
  blind_date
  blind_bend
  blindside
  blindfolded
  blind_snake
  blind_curve
  blind_person
  blind_flying
  blindfold
  blind_man
  blind_gut
  blind_gentian