dead-end

Short definition from Wiktionary

Adjective

1. 1
   Going nowhere; blocked.

Verb

1. 1
   To come to a dead-end.
2. 2
   To come to nothing; to reach a hopeless situation.

Noun

1. 1
   A road with no exit.
2. 2
   A position that offers no hope of progress.
3. 3
   A street or path or tunnel that goes nowhere or is blocked on one end.
4. 4
   The inner end of a drift or tunnel.
5. 5
   A position that offers no hope of change or progress.
6. 6
   A split end in the hair.