CARDBOARD

[noun] [U] - material like very thick stiff paper, usually pale brown in colour, which is used esp. for making boxesThe children were playing with a toy farm made out of cardboard.She brought the shopping home in a cardboard box.We were standing next to a cardboard cutout of the actor in the cinema foyer.(figurative disapproving) I've never enjoyed his plays - somehow all his characters are all cardboard (= artificial).