<p><strong>Noun</strong></p><ul><li>a stiff, firm board made of sheets of paper pasted or layers of paper pulp pressed together.</li><li>Older Slang: a card, as a visiting card or a playing card.</li><li>Older Slang: a ticket, as for the theater.</li></ul><p><strong>Adjective</strong></p><ul><li>made of pasteboard.</li><li>unsubstantial, flimsy, or sham.</li></ul>