IPA: /ˈkɑːrdˌbɔːrdi/
KK: /ˈkɑrdˌbɔrdi/
Having a texture or appearance similar to cardboard, often stiff or flat.
The box was made of a cardboardy material that felt cheap and flimsy.
The word 'cardboardy' is formed from 'cardboard' (a composite material made from cellulose fibers, originally from the word 'card' meaning a thick paper) and the suffix '-y' (meaning characterized by or resembling). Thus, 'cardboardy' describes something that has the characteristics or qualities of cardboard.
Think of 'cardboard' as a material and remember that 'cardboardy' means something that resembles or has the qualities of cardboard.
No commonly confused words.