cardboard
US /ˈkɑːrd.bɔːrd/
UK /ˈkɑːrd.bɔːrd/

1.
papelão
a stiff material made from paper pulp, typically used for making boxes and other containers
:
•
The moving boxes were made of thick cardboard.
As caixas de mudança eram feitas de papelão grosso.
•
She cut a piece of cardboard to use as a base for her model.
Ela cortou um pedaço de papelão para usar como base para seu modelo.
1.
plano, fraco
lacking depth or substance; flimsy or unconvincing
:
•
The characters in the movie were so cardboard, I couldn't connect with them.
Os personagens do filme eram tão planos, não consegui me conectar com eles.
•
His excuse for being late was rather cardboard.
A desculpa dele para se atrasar era bastante fraca.