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.
Ні, це - ні, це зовсім не шматок пирога.
This is not a piece of cake degree.
Це не шматок ступеня пирога.
This is not a piece of cake.
Це не шматок торта.
The IELTS exam is not a piece of cake.
Іспит IELTS - це не шматок пирога.
However, being a plus size model is not a piece of cake.
Однак бути моделлю плюсового розміру - це не шматок пирога.