This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A road or passage having no exit; a cul-de-sac.

n. A situation that is so difficult that no progress can be made; a deadlock or a stalemate: reached an impasse in the negotiations.

n. a road with no exit; a cul-de-sac

n. a deadlock or stalemate situation in which no progress can be made

n. An impassable road or way; a blind alley; cul-de-sac; fig., a position or predicament affording no escape.

n. a street with only one way in or out

n. a situation in which no progress can be made or no advancement is possible

"Talks were expected to continue Thursday, and few on either side expected a long-term impasse."

thoroughfare    situation   

cul-de-sac   

Alsace    Cass    Glass    Grass    Grasse    Jas    Mass    Mass.    Nass    Pass   

stalemate    casin    mortice    racialism    partage    engine driver    gx    dialogo    muera    cond