Definition of "cardboard" in English

noun

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

2. (figurative) Something flat or insubstantial.

adjective

1. Made of or resembling cardboard; (figurative) flat or flavorless.

   • MUMMER 3 pulls out an inflated cushion with a very cardboard crown on it.