Translation of "Dishwater" in German

This coffee tastes like dishwater.

Der Kaffee hier schmeckt wie Spülwasser.

Tom put the dishes in the dishwater.

Tom tat das Geschirr ins Abwaschwasser.

- The dull lecture bored the audience.
- The lecture, dull as dishwater, bored the audience.

Der platte Vortrag langweilte das Publikum.