'Impiousness' definitions:

Definition of 'impiousness'

noun

Unrighteousness by virtue of lacking respect for a god [syn: impiety, impiousness] [ant: piety, piousness]

From: GCIDE

Impious \Im"pi*ous\, a. [L. impius; pref. im- not + pius piou. See Pious.] Not pious; wanting piety; irreligious; irreverent; ungodly; profane; wanting in reverence for the Supreme Being; as, an impious deed; impious language. [1913 Webster]
When vice prevails, and impious men bear away, The post of honor is a private station. --Addison.
Syn: Impious, Irreligious, Profane.
Usage: Irreligious is negative, impious and profane are positive. An indifferent man may be irreligious; a profane man is irreverent in speech and conduct; an impious man is wickedly and boldly defiant in the strongest sense. Profane also has the milder sense of secular. --C. J. Smith. -- {Im"pi*ous*ly}, adv. -- {Im"pi*ous*ness}, n. [1913 Webster]