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- When Aunt Petunia put a quarter of unsweetened grapefruit onto Dudley's plate with a tremulous "There you are, Diddy darling," Dudley glowered at her.Chapter 3 -- The Invitation (4% in)
- She caught sight of Mr. Diggory's feet, and slowly, tremulously, raised her eyes to stare up into his face; then, more slowly still, she looked up into the sky.Chapter 9 -- The Dark Mark (61% in)
There are no more uses of "tremulous" in Harry Potter (#4) and the Goblet of Fire.
Typical Usage (best examples)