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Definition of effrontery : Impudence or boldness in confronting or in transgressing the bounds of duty or decorum; insulting presumptuousness; shameless boldness; barefaced assurance.

Synonyms:

study at temerity, familiarity, nerviness, crust, given, nerve, courtesy, self-assertion, assurance, self-reliance, forwardness, pertness, uppityness, laying claim, cheek, pushiness, supposition, trust, impudency, supposal, gall, self-confidence, audaciousness, cheekiness, sassiness, presumption, chutzpah, assumption, premise, confidence, uppishness, incivility, sauce, attitude, assertion, impudence, face, precondition, premiss, brass, overconfidence, disrespect

contemptuousness, brazenness, irreverence, impertinence, disrespectfulness, audacity, derisiveness, arrogance, callousness, defiance, rudeness, disesteem, discourtesy, boldness, sauciness, insolence, presumptuousness, brashness

Usage examples:

• " I'll bet you a pony that you don't either," said Jodey, striving, as young fellows will, to cover his ignorance by a display of effrontery.
• Ladies are to be seen in the streets quite regardless of the Mahommedan custom which presumes a veil to be necessary for an appearance in public; and, to tell the truth, the Mahommedans in general do not appear to be much shocked by their effrontery. - "An Unprotected Female at the Pyramids", Anthony Trollope.
• Her self- possession, I had almost said her effrontery, took me quite aback. - "The Passenger from Calais", Arthur Griffiths.