vertiginous

/vərˈtijənəs/
adjective

1. causing vertigo, especially by being extremely high or steep
2. relating to or affected by vertigo

Beckett was ten, and constantly in motion, climbing up vertiginous things, practicing his ninja moves, and biking through our neighborhood’s streets with abandon, usually with his best friend Annabel Montpelier, the scourge of stroller-pushing mothers within a five-mile radius.

– Morgan Matson, Since You’ve Been Gone, page 12