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gnarl‧y

1 a gnarly tree or branch is rough and twisted with hard lumps [= gnarled]
2 gnarly hands or fingers are twisted, rough, and difficult to move, usually because they are old [= gnarled]
3 American English spoken a word meaning very good or excellent, used by young people :
'Look at the size of that wave.' 'Gnarly!'
'Look at the size of that wave.' 'Gnarly!'4 American English spoken a word meaning very bad, used by young people :
a gnarly car wreck
a gnarly car wreck