Douglas Harper's Etymology Dictionary
Usage examples of "bold-face".
He was followed closely by Fitch who chugged along behind and grinned in bold-faced relief.
He was a bold-faced rascal, a thief, he added, and occasionally a highwayman.
They have used bold-faced letters, Gothic-type letters, Greek letters, both capital and small, subscripts, superscripts, asterisks, even Hebrew letters.