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жестоко ошибаться stresses
gen.	be badly wrong (grafleonov); be quite wrong
inf.	be seriously mistaken (Andrey Truhachev); be all wet (Andrey Truhachev); be very much mistaken (Andrey Truhachev)
rhetor.	be sorely mistaken (Alex_Odeychuk); be stunningly mistaken (about ... – по поводу ... Alex_Odeychuk)

жестоко ошибаться: 5 phrases in 3 subjects

General	3
Informal	1
Makarov	1