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трудноразрешимая проблемаstresses
gen. a tough problem; a difficult question to decide; nasty problem; hard-to-solve problem; weighty problem; formidable problem (Азери); Gordian knot (Val_Ships)
Makarov. tough problem
polit. persistent problem (ssn)
scient. difficult challenge (Computerworld Alex_Odeychuk)
slang tough egg to crack (Interex)
tech. intractable problem; unsolvable problem
трудноразрешимая проблема: 2 phrases in 2 subjects
Economy1
Makarov1