effrontery

Etymology

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).

noun

1. (uncountable) Insolent and shameless audacity.
   We even had the effrontery to suggest that he should leave the country.
   Let not the Englishman in Scotland believe that the undoffed hat, the curt reply, the apparent assumption of equality, all spring from deliberate effrontery, and are wholly beyond the reach of southern influence. 1859, The Christian Remembrancer, volumes 37-38, page 250
2. (countable) An act of insolent and shameless audacity.
   Any refusal to salute the president shall be counted as an effrontery.
   All was going as planned until the bag hit a snag and failed to surround the entire nest. This effrontery was too much. The wasps exploded off the nest at me. 2016, Justin O. Schmidt, The Sting of the Wild, Johns Hopkins University Press,, page 92