boldface noun 1verb 1adjective 1forms 3 noun1 •A font that is dark, having a high ratio of ink to white space, written or drawn with thick strong lines. verb1 •To print or write in a boldfaced font.Boldface the due date so they are sure to see it. adjective1 •Synonym of boldfaced.If you make a word boldface, it is boldface on the screen. — 1985 formsboldfaced · boldfacing · boldfaces