Covered or strengthened with cardboard.

The flat appearance of objects in a scene in the absence of proper depth perception.

A wood-based material resembling heavy paper, used in the manufacture of boxes, cartons and signs.

Made of or resembling cardboard; (figuratively) flat or flavorless.

plural of cardboard

plural of cardboard box

(rare) Resembling or characteristic of a cardboard box.

(Australia, slang, humorous) Box wine.

plural of cardboard cutout

(nonstandard) Alternative form of cardboard box