Kreacher seemed to be in a better mood on his reappearance, his bitter muttering had subsided somewhat and he submitted to orders more docilely than usual, though once or twice Harry caught the houseelf staring at him avidly, but always looking quickly away whenever he saw that Harry had noticed.
There are no more uses of "docile" in the book.
Show samples from other sources
[We] show them all the tricks that can save them from death. They listen, they are docile—but when it begins again, in their excitement they do everything wrong.
Erich Maria Remarque -- All Quiet on the Western Front
The wights are convinced we peculiar children are docile and weak.