The Collaborative International Dictionary
Blushless
Blushless \Blush"less\, a. Free from blushes; incapable of blushing; shameless; impudent.
Vice now, secure, her blushless front shall raise.
--Dodsley.
Wiktionary
blushless
a. Without blushes; unblushing.
Usage examples of "blushless".
And twenty names of cobblers turn’d to squires, Aid the bold language of these blushless liars.
At Anspach first my feud with you began-- Anspach, my Eden, violated and shamed By blushless tramplings of your legions there!