How do you say Cool in German?

Answer 1

The German verb to cool is kühlen, the correponding adjective is kühl - a cool breeze = eine kühle Briese

The Germans have also adopted the English word cool in the sense of good, e.g. he's a cool guy = er ist ein cooler Typor that's cool! = das ist cool!

Another word from the 90s is "geil:"

That pool is so cool.

Das Schwimmbad is super geil.