All 6 Uses

pious
in
Young Goodman Brown
(Edited)

As he spoke he pointed his staff at a female figure on the path, in whom Goodman Brown recognized a very pious and exemplary dame, who had taught him his catechism in youth, and was still his moral and spiritual adviser, jointly with the minister and Deacon Gookin.

pious = highly religious and moral
"The devil!" screamed the pious old lady.

pious = highly religious
Once the listener fancied that he could distinguish the accents of towns-people of his own, men and women, both pious and ungodly, many of whom he had met at the communion table, and had seen others rioting at the tavern.

pious = religious
these grave, reputable, and pious people
*

pious = highly religious and moral
Another verse of the hymn arose, a slow and mournful strain, such as the pious love, but joined to words which expressed all that our nature can conceive of sin, and darkly hinted at far more.

pious = religious
Thither came also the slender form of a veiled female, led between Goody Cloyse, that pious teacher of the catechism, and Martha Carrier, who had received the devil's promise to be queen of hell.

Definitions:

(1) (pious as in: a good, pious woman)
religious or highly moral
(2) (pious as in: a pious hypocrite)
self-righteous (acting as though one is, or believing one is highly moral when it is not true)
(3) (pious as in: cling to the pious hope)
(describing a hope or wish as) sincere, but highly unlikely
(4) (meaning too rare to warrant focus)
Much more rarely, piety can refer to devotion or faithfulness as Proust used it in the book, Swann's Way:

"...but when, as had befallen me, such an anguish possesses one's soul before Love has yet entered into one's life, then it must drift, awaiting Love's coming, vague and free, without precise attachment, at the disposal of one sentiment to-day, of another to-morrow, of filial piety or affection for a comrade."