All 3 Uses of

pious
in
Angela's Ashes

People everywhere brag and whimper about the woes of their early years, but nothing can compare with the Irish version: the poverty; the shiftless loquacious alcoholic father; the pious defeated mother moaning by the fire; pompous priests; bullying schoolmasters; the English and the terrible things they did to us for eight hundred long years.
Chpt 1

pious = highly religious and moral

The rain drove us into the church.... Limerick gained a reputation for piety, but we knew it was only the rain.
Chpt 1 *

piety = religious belief

We will have the Gifts of the Holy Ghost: Wisdom, Understanding, Counsel, Fortitude, Knowledge, Piety, the Fear of the Lord.
Chpt 8

piety = highly religious and moral behavior

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)
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."