troublesome, tricky, complicated; see complex 2, difficult 2.
"knotty." YourDictionary, n.d. Web. 05 December 2018. <https://thesaurus.yourdictionary.com/knotty>.
knotty. (n.d.). Retrieved December 05th, 2018, from https://thesaurus.yourdictionary.com/knotty
Difficult to understand because of intricacy:
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