dead-end

(noun) a passage with access only at one end. Synonyms: cul, cul de sac, dead end.

(noun) a situation in which no progress can be made or no advancement is possible. Synonyms: deadlock, dead end, impasse, stalemate, standstill. Example: "Reached an impasse on the negotiations."

(adj) lacking opportunities for development or advancement. Example: "Stuck in a dead-end job."