"Rosmerta?" said Professor McGonagall incredulously, but before she could go on, there was a knock on the door behind them and Professors Sprout, Flitwick, and Slughorn traipsed into the room, followed by Hagrid, who was still weeping copiously, his huge frame trembling with grief.
There are no more uses of "copious" in the book.
Show samples from other sources
She took copious notes.
The vehemence of my agitation brought on a copious bleeding at the nose, and still Heathcliff laughed, and still I scolded.