Noun impasse has 2 senses
  1. deadlock, dead end, impasse, stalemate, standstill - a situation in which no progress can be made or no advancement is possible; "reached an impasse on the negotiations"
    --1 is a kind of situation
  2. blind alley, cul de sac, dead-end street, impasse - a street with only one way in or out
    --2 is a kind of thoroughfare