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нежданно-негаданно stresses
gen.	against all expectations (Franka_LV); quite unexpectedly (Franka_LV); out of the blue (Franka_LV); out of a clear sky (Супру); out of a clear blue sky (Супру); like a bolt from the blue (Супру); all of a sudden (Abysslooker)
slang	out of the blue (Johnny came out of the blue to catch the pass and score a touchdown! == Джонни, выскочив словно из-под земли, принял пас и открыл счёт!)
нежданно негаданно
inf.	quite unexpectedly; suddenly