A dead end job or course of action is one that you think is bad because it does not lead to further developments or progress. Waitressing was a dead-end job
{i} cul de sac, street which has no exit; something which has no future, something which will never produce positive results
The end of a water main which is not connected to other parts of the distribution system Source: US EPA
The end of a rope or part of a device that is not active or load carrying Also called the bitter end