cardboard
n
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
cardboard city
n
Informal an area of a city in which homeless people sleep rough, often in cardboard boxes
English Collins Dictionary - English Definition & Thesaurus  

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"Collins English Dictionary 5th Edition first published in 2000 © HarperCollins Publishers 1979, 1986, 1991, 1994, 1998, 2000 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"