Definition of knotty adjective from the Oxford Advanced American Dictionary

     

    knotty

     adjective
    adjective
    NAmE//ˈnɑt̮i//
     
    (knottier, knottiest)
     
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  1. 1complicated and difficult to solve synonym thorny a knotty problem
  2. 2having parts that are hard and twisted together the knotty roots of the old oak tree
See the Oxford Advanced Learner's Dictionary entry: knotty