Both Uses

pious
in
Kidnapped, by Robert Louis Stevenson
(Edited)

I have never felt such pity for any one in this wide world as I felt for that half-witted creature, and it began to come over me that the brig Covenant (for all her pious name) was little better than a hell upon the seas.
Chpt 5

pious = religious
...a number of hymns and pious books...
Chpt 16 *

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."