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thorny

adjective [before noun] (PROBLEM/SUBJECT)
 
 
/ˈθɔː.ni/ US  /ˈθɔːr-/

Definition

describes a problem or subject that is difficult to deal with: the thorny issue of taxationComplicated and difficult to doDifficult to understand
(Definition of thorny adjective (PROBLEM/SUBJECT) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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