CARDBOARD
cardboard, unlifelike
(adjective) without substance; “cardboard caricatures of historical figures”
cardboard, composition board
(noun) a stiff moderately thick paper
Source: WordNet® 3.1
Etymology
Noun
cardboard (countable and uncountable, plural cardboards)
A wood-based material resembling heavy paper, used in the manufacture of boxes, cartons and signs.
Usage notes
Despite widespread general use in English, the term cardboard is deprecated in commerce and industry as not adequately defining a specific product.
Adjective
cardboard
Made of or resembling cardboard; (figurative) flat or flavorless.
• Twentieth-Century Scottish Drama, page 501
MUMMER 3 pulls out an inflated cushion with a very cardboard crown on it.
Source: Wiktionary
Card"board, n.
Definition: A stiff compact pasteboard of various qualities, for making
cards, etc., often having a polished surface.
Source: Webster’s Unabridged Dictionary 1913 Edition