The term "in creases" refers to the ridges and folds on a surface. Its antonyms, on the other hand, describe flatness and smoothness. Words such as "flat", "level", "smooth", "even", and "plain" are all antonyms of "in creases". These words are often used to describe surfaces that are opposite to the crumpled and folded texture of creases. While creases may be desirable in some materials like fabric, it is often unwanted on other surfaces like paper, skin or woodworking. Antonyms of "in creases" may feature in the process of ironing, sanding or polishing surfaces to achieve their smooth texture.