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сложные вопросы stresses
gen.	weighty questions (Sergei Aprelikov)
сложный вопрос
gen.	dilemma (Tanya Gesse); complicated issue; contentious issue (Ivan Pisarev)
Игорь Миг	hardball question; intractable problem
dipl.	complex issue; delicate subject; tricky question; knotty issue; knotty problem; knotty question
math.	intricate question
mil.	complicated question
slang	curly one (Geez mate, that's a curly one! VLZ_58)
tech.	complicated problem; difficult matter (Ammaniac)

сложные вопросы: 22 phrases in 6 subjects

Construction	1
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General	13
Jargon	1
Makarov	5
Psychology	1