effrontery

From late 17th century French effronterie, from effronté (“shameless, insolent”), from Old French esfronté, from Vulgar Latin *exfrontātus. Compare Latin effrōns (“barefaced”), from the prefix ex- (“from”) + frōns (“forehead”) (English: front). By surface analysis, ef- +‎ front +‎ -er +‎ -y.