Cardboard
Cardboard adjective - Without substance.
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Synonyms for Cardboard
Flat and cardboard are semantically related. In some cases you can use "Flat" instead an adjective "Cardboard".
Nearby Word: card
Mutual synonyms
Both words in one sentence
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And those without them had flat-tops and wore gym clothes and break-danced on top of cardboard.
Source: The '80s -
As a prank the folks at All Too Flat once created a large cardboard cutout version of the guy on the crosswalk sign, then put it in the middle of the street and see what happened.
Source: Cardboard Pal -
Each one is different and the final one is an Impossible Task—the flat piece of cardboard just can't be folded it into a box shape.
Source: Assembly Line Fast-Forward
Cite this Source
Flat and Cardboard. (2016). Retrieved 2026, August 07, from https://thesaurus.plus/related/cardboard/flat
Cardboard & Flat. N.p., 2016. Web. 07 Aug. 2026. <https://thesaurus.plus/related/cardboard/flat>.
Flat or Cardboard. 2016. Accessed August 07, 2026. https://thesaurus.plus/related/cardboard/flat.
Google Ngram Viewer shows how "cardboard" and "flat" have occurred on timeline