Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun cardboard

1 sense of cardboard

Sense 1
cardboard, composition board -- (a stiff moderately thick paper)
       => paper -- (a material made of cellulose pulp derived mainly from wood or rags or certain grasses)
       => packing material, packing, wadding -- (any material used especially to protect something)

Antonyms of adj cardboard

1 sense of cardboard

Sense 1
cardboard, unlifelike -- (without substance; "cardboard caricatures of historical figures")

INDIRECT (VIA artificial) -> natural -- (existing in or produced by nature; not artificial or imitation; "a natural pearl"; "natural gas"; "natural silk"; "natural blonde hair"; "a natural sweetener"; "natural fertilizers")

Similarity of adj cardboard

1 sense of cardboard

Sense 1
cardboard, unlifelike -- (without substance; "cardboard caricatures of historical figures")
       => artificial (vs. natural), unreal -- (contrived by art rather than nature; "artificial flowers"; "artificial flavoring"; "an artificial diamond"; "artificial fibers"; "artificial sweeteners")

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