Gnarly describes something twisted, knotted, or gnarled, like an old tree with thick roots that wind around each other in tangled loops. A gnarly branch might be covered in bumps and curves, shaped by decades of wind and weather. The word comes from gnarl, which means a hard, knotty lump in wood.

You might see gnarly tree trunks in ancient forests, where the bark twists and bulges with age. A gnarly hand might be weathered and rough from years of hard work. The word captures that sense of something tough and twisted, shaped by time and experience.

In surfing slang, gnarly took on new meanings. Surfers started using it to describe dangerous, challenging waves that were as twisted and unpredictable as gnarled wood. From there, it spread to mean anything intense or extreme, whether awesome or awful. A skateboarder might call a difficult trick gnarly, or say “That wipeout was gnarly!” after a rough fall. In this casual usage, gnarly can mean impressively difficult, dangerously cool, or just plain intense.