Sir Terry’s output was prodigious. In addition to the 41 Discworld titles, he wrote 16 non-Discworld novels, a four-book series called The Science of Discworld (with Ian Stewart and Jack Cohen) and co-wrote the five-book The Long Earth series with Stephen Baxter. All this in addition to numerous graphic novels, short stories, theater adaptations… and much more. 

Prodigious doesn’t cover it. His writing was clear, engaging, entertaining, thought-provoking—and don’t forget extremely funny! So make it prodigious genius. I’ve said it before: in a hundred years, if there is still a civilization in a hundred years, Terry Pratchett will still be read and enjoyed. Hell, he’ll still be read and enjoyed in 400 years (although the odds of there being a human species, let alone civilization, still around then are pretty long.)

GNU Terry Pratchett

The Turtle Moves

Mind How You Go