This is the 15574th most frequent Polish word.
strasznej
"Strasznej" means "terrible" or "frightening" (feminine form, genitive or dative case).
The word 'strasznej' is used ironically to intensify the positive quality of the cake.
Mam ochotę na strasznej dobre ciasto.
I feel like having an amazingly good cake.
The word 'strasznej' describes an extreme condition of the weather, emphasizing its intensity.
Noc była strasznej burzliwa.
The night was terrifyingly stormy.
Here, 'strasznej' denotes something frightening or related to fear in the story.