card·board

[kahrd-bawrd, -bohrd]
noun
1.
a thin, stiff pasteboard, used for signs, boxes, etc.
adjective
2.
resembling cardboard, especially in flimsiness: an apartment with cardboard walls.
3.
not fully lifelike; shallow; two-dimensional: a play with cardboard characters.

Origin:
1840–50; card1 + board

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
cardboard (ˈkɑːdˌbɔːd) [Click for IPA pronunciation guide]
 
n
1.  a.  a thin stiff board made from paper pulp and used esp for making cartons
 b.  (as modifier): cardboard boxes
 
adj
2.  (prenominal) without substance: a cardboard smile; a cardboard general

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Cardboard is always a great word to know.
So is ort. Does it mean:
a fool or simpleton; ninny.
a scrap or morsel of food left at a meal.
Etymonline
Word Origin & History

cardboard
1848, from card (n.) + board. Fig. sense is from 1893.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Cut a square door, also cut a circle of cardboard to more than cover the door.
Create a solar reflector with cardboard and aluminum foil.
The choice in that case is whether to buy a house or a cardboard box.
She stepped behind the cardboard voting screen, and opened the voluminous
  ballot paper, carefully scrolling down.
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