a blind alley

být slepá ulice, nemít budoucnost

Tom thinks the job of motor mechanic is a blind alley, as in ten years` time, all cars may be electronic and computer-driven! (English Idioms, Oxford)

The latest evolutionary theory may turn out to be a blind alley.(CIDI)

This sort of thinking just seems to be leading us up/down a blind alley.(CALD)

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