/kahrd"bawrd', -bohrd'/ , n.
1. a thin, stiff pasteboard, used for signs, boxes, etc.
adj.
2. resembling cardboard, esp. in flimsiness: an apartment with cardboard walls.
3. not fully lifelike; shallow; two-dimensional: a play with cardboard characters.
[ 1840-50; CARD 1 + BOARD ]