This was unexpected.
I read years ago that about 80% of the most commonly used English words have their origin in German. Point to something on your body or in your immediate surroundings and it may have a German cousin. Commonly used, everyday words, too, have German origins--eat (essen); go (gehen); have (haben), etc.
How about adjectives? The same is true there.
The English word "good" has its roots in the German "gut". Good's irregular comparative and superlative forms come from German as well. Better in German is besser; best, is best.
What about "bad", then? Does that also come from German? Nope. Bad in German is schlecht. schlecht, schlechter, schlechtest. So what's the etymology of "bad"?
Well, here's where it gets intersting. Middle English. It may stem from the Old English bǣddel which means "hermaphrodite, womanish man".