Something that is difficult to do.
This idiom means that something is not easy and requires effort, skill, or patience to accomplish.
No, this-- no it is not a piece of cake at all.
Nie, to... Nie, to wcale nie jest kawałek ciasta.
This is not a piece of cake degree.
To nie jest stopień ciasta.
This is not a piece of cake.
To nie jest kawałek ciasta.
The IELTS exam is not a piece of cake.
Egzamin IELTS nie jest kawałkiem ciasta.
However, being a plus size model is not a piece of cake.
Jednak bycie modelem plus size nie jest kawałkiem ciasta.