Robert was a square-rigged, swart, tempestuous boy, arrogant where there seemed to be no reason for arrogance, longed for by the anemic, milky sort of girls, yet ever supercilious to them.
There are no more uses of "tempestuous" in the book.
Show samples from other sources
The fiddlers begin a swift, tempestuous tune, and Keenan takes my hip in one hand and my fingers in the other.
Sabaa Tahir -- An Ember in the Ashes
"What about Jacqueline Du Pre?" she’d always asked, referring to her own idol, a talented and tempestuous cellist who’d been stricken with multiple sclerosis at the age of twenty-eight and died about fifteen years later.