Other forms: toweringly
Towering things are extremely tall, like the towering skyscrapers in New York City or the towering redwoods in northern California.
Use the adjective towering to describe gigantic things that loom over everything (or everyone) else. There's the towering basketball player in your yoga class who is at least a foot taller than the other students, and the towering addition your neighbor is building on his house — the one that will block your view of the lake. The verb tower means "to rise high," from the Latin for "tower," turris.