adjective, knottier, knottiest.
having knots; full of knots: a knotty piece of wood.
involved, intricate, or difficult: a knotty problem.

1200–50; Middle English cnotti. See knot1, -y1

knottily, adverb
knottiness, noun
unknotty, adjective

2. complex, complicated. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
knotty (ˈnɒtɪ)
adj , -tier, -tiest
1.  (of wood, rope, etc) full of or characterized by knots
2.  extremely difficult or intricate

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
On the knotty but crucial question of how to reduce deforestation and the
  emissions it causes, progress was scanty.
It cloaks its craggy melodies within knotty instrumental textures.
For anyone wondering how pointlessly knotty the film itself can become, that's
  a fair indication.
The twigs are slender, spreading, zigzag with short or dark brown knotty spurs.
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