This is the 8647th most frequent Polish word.
płaskie
"Flat."
The word 'płaskie' describes the shoes as having a flat sole, a quality characteristic of the item.
Kupiłam płaskie buty, które są bardzo wygodne.
I bought flat shoes that are very comfortable.
The word 'płaski' describes the direct attribute of the table's flatness.
Stół jest płaski i idealny do rysowania.
The table is flat and perfect for drawing.
The word 'płaskie' is used in a comparative sense to describe landscapes.