1. (noun) a stiff moderately thick paper

• composition board

2. (adjective) without substance

• unlifelike

1. (adjective) without substance

• artificial
• unreal

1. (noun) a stiff moderately thick paper

• binder board
• binder's board
• card
• corrugated board
• corrugated cardboard
• paperboard
• poster board
• posterboard
• pasteboard
• strawboard

1. (noun) a stiff moderately thick paper

• packing
• packing material
• wadding
• paper