QListWidgetItem* item = new QListWidgetItem("Item 1"); QFont font("Arial", 12, QFont::Bold); item->setFont(font); ui->listWidget->addItem(item);In this example, we create a new QListWidgetItem named "Item 1". We then create a QFont object with the font family set to Arial, size set to 12, and bold style. Finally, we use the setFont() method to set the font of our item, and add it to the listWidget in our User Interface. This feature is part of the Qt Widgets module, and therefore is included in the Qt framework package.