EFFRONTERY
presumption, presumptuousness, effrontery, assumption
(noun) audacious (even arrogant) behavior that you have no right to; “he despised them for their presumptuousness”
Source: WordNet® 3.1
Etymology
Noun
effrontery (countable and uncountable, plural effronteries)
(uncountable) Insolent and shameless audacity.
(countable) An act of insolent and shameless audacity.
Source: Wiktionary
Ef*front"er*y, n.; pl. Effronteries. Etym: [F. effronterie, fr.
effronté shameless, fr. L. effrons, -ontis, putting forth the
forehead, i. e., barefaced, shameless; ex + frons the forehead. See
Front.]
Definition: Impudence or boldness in confronting or in transgressing the
bounds of duty or decorum; insulting presumptuousness; shameless
boldness; barefaced assurance.
Corruption lost nothing of its effrontery. Bancroft.
Syn.
– Impudence; sauciness. See Impudence.
Source: Webster’s Unabridged Dictionary 1913 Edition