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- Oh, no, sir, no ... Dobby will have to punish himself most grievously for coming to see you, sir.Chapter 2 — Dobby's Warning (19% in)
grievously = seriously (badly)
- Better sent home, grievously injured, than remain here sir!Chapter 10 — The Rogue Bludger (82% in)
grievously = badly (seriously)
There are no more uses of "grievous" in Harry Potter (#2) and the Chamber of Secrets.
Typical Usage (best examples)