English version

a thorny question/problem/issue etc

From Longman Dictionary of Contemporary Englisha thorny question/problem/issue etca thorny question/problem/issue etcCOMPLICATEDa question etc that is complicated and difficult the thorny question of immigration policy thorny
Examples from the Corpus
a thorny question/problem/issue etcMelding the top managements also would be a thorny issue.None of these struck me as particularly penetrating answers to a thorny problem.In addition, sending encrypted data over international boundaries represents a thorny issue: it is still illegal in some countries.
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Word of the day priceless extremely valuable