Having a crease or creases.
Having a flutelike tone; fluty
Arranged in folds like those of a fan; pleated.
Full of crimps; wavy.
Having a surface free from irregularities, roughness, or projections; even.
The definition of flat is something with a smooth level surface, something touching with as many points as possible, something that doesn't vary, or something that is dull in taste or appearance.
Of uniform distribution:
Find another word for corrugated. In this page you can discover 20 synonyms, antonyms, idiomatic expressions, and related words for corrugated, like: smooth, flat, wrinkled, grooved, creased, crumpled, ridged, crinkled, furrowed, fluted and even.