1
a
: marked by or showing reverence for deity and devotion to divine worship
b
: marked by conspicuous religiosity
… a hypocrite,—a thing all pious words and uncharitable deeds.—
Charles Reade
3
: showing loyal reverence for a person or thing : dutiful
5
: deserving commendation : worthy
a pious effort
piously
adverb
piousness
noun
pi·ous·ness
: the quality or state of being pious
Moments after she was baptized a Catholic, her piousness lapsed and she was her old irreverent New York self …—
Susan Isaacs, New York Times Book Review, 29 Mar. 1987
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Merriam-Webster unabridged



