
1) Artificial 2) Paperboard 3) Pasteboard 4) Poster board 5) Strawboard 6) Unlifelike
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https://www.crosswordclues.com/clue/cardboard

1) Cereal box material 2) Flimsy 3) Gift-box material 4) Inferior 5) Without substance
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https://www.crosswordclues.com/clue/cardboard

Cardboard is a generic term for a heavy-duty paper of various strengths, ranging from a simple arrangement of a single thick sheet of paper to complex configurations featuring multiple corrugated and uncorrugated layers. Despite widespread use in general English, the term is deprecated in business and industry. Material producers, container manufa...
Found on
http://en.wikipedia.org/wiki/Cardboard

• (n.) A stiff compact pasteboard of various qualities, for making cards, etc., often having a polished surface.
Found on
http://thinkexist.com/dictionary/meaning/cardboard/

General term for stiff, bulky paper such as index, tag, or bristol.
Found on
http://www.e-printing.co.uk/glossary.htm
Card'board` (kärd'bōrd`)
noun A stiff compact pasteboard of various qualities, for making cards, etc., often having a polished surface.
Found on
http://www.encyclo.co.uk/webster/C/25

Cardboard is a kind of stiff paper or pasteboard made by sticking together several sheets of paper.
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http://www.probertencyclopaedia.com/browse/AC.HTM

[
adj] - resembling cardboard especially in flimsiness 2. [adj] - without substance 3. [n] - a stiff moderately thick paper
Found on
http://www.webdictionary.co.uk/definition.php?query=cardboard

A stiff form of paper most commonly used to manufacture packaging.
Found on
https://www.encyclo.co.uk/local/20687
unlifelike adjective without substance; `cardboard caricatures of historical figures`
Found on
https://www.encyclo.co.uk/local/20974
No exact match found.