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English definition of “cardboard”

cardboard

noun [U] uk   /ˈkɑːd.bɔːd/ us    /ˈkɑːrd.bɔːrd/
B2 material like very thick stiff paper, usually pale brown in colour, used especially for making boxes: a cardboard box

cardboard

adjective uk   /ˈkɑːd.bɔːd/ us    /ˈkɑːrd.bɔːrd/ disapproving
relating to something, usually a character in a film or play, that does not seem to be real or interesting: I've never enjoyed his plays - somehow all his characters are cardboard.
(Definition of cardboard from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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