| n. | 1. | A stiff compact pasteboard of various qualities, for making cards, etc., often having a polished surface. |
| Noun | 1. | cardboard - a stiff moderately thick paper Synonyms: composition board |
| Adj. | 1. | cardboard - resembling cardboard especially in flimsiness; "apartments with cardboard walls" Synonyms: flimsy |
| 2. | cardboard - without substance; "cardboard caricatures of historical figures" Synonyms: unlifelike |