gnarly
adjective
Origin
From gnarl (“knot in wood”) + -y. The slang senses were particularly popularized by US surf culture in the 1970s.
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.