Updated:Nov 7, 2018Original:May 21, 2013How to Say "I Don't Know" in GermanLearn how to say "I don't know" in German in this German lesson from Howcast.TranscriptHow to say, "I don't know." Ich weiss nicht. Ich weiss nicht. Now you try. You might also say, "No idea." Keine Ahnung. Keine Ahnung. Now you try. And that's how to say, "I don't know."