GNARLY
gnarled, gnarly, knotted, knotty, knobbed
(adjective) used of old persons or old trees; covered with knobs or knots; “gnarled and knotted hands”; “a knobbed stick”
Source: WordNet® 3.1
Etymology
Adjective
gnarly (comparative gnarlier, superlative gnarliest)
Having or characterized by gnarls; gnarled.
(slang) Excellent; attractive.
(slang, US) Dangerous; difficult.
(slang, US) Unpleasant, awful, ugly.
(slang, US) Of music or a sound: harsh.
Usage notes
Note the word’s contradictory senses of “good” and “bad”. Its meaning varies by community and context, and may be indicated by extra-verbal cues such as tone of voice. The sense of “good” is particularly associated with surf culture, to the point of being somewhat clichéd as in “gnarly wave, dude!”.
Synonyms
• (gnarled): gnarled, knobbly, knobby
• (slang: excellent; attractive): cool
• (slang, US: unpleasant, awful): awful, dreadful, nasty
• (slang, US: harsh (of music or sound)): discordant
Source: Wiktionary
Gnarl"y, a.
Definition: Full of knots; knotty; twisted; crossgrained.
Source: Webster’s Unabridged Dictionary 1913 Edition