pasteboard noun 3adjective 1forms 1 noun3 •Card stock.All visible objects, man, are but as pasteboard masks. — 1851 •A widget allowing multiple users to paste and share text or other items. •(slang, no longer used) A person's visiting card.[…] he no sooner learnt that the British officer in command had sent in his pasteboard, than he instantly returned the visit […] — 1860 adjective1 •(figurative) unsubstantial; flimsy formspasteboards