All 3 Uses

penitent
in
The Power and the Glory, by Cooke
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The explanation of how the girl came to be riding in his car that Sunday morning was neither as full nor as penitent as Miss Lydia could have wished; yet it did recognize the impropriety of the act, and was, in so far, satisfactory.†
Chpt 8 *
I'm sorry," she said, bending forward to lay a wistful, penitent hand on that of Miss Sessions.†
Chpt 8
Dawn came with a soft wind out of the west, all the odours of spring on its breath, and a penitent warmth to apologize for last night's storm.†
Chpt 18

Definitions:

(1) (penitent)
feeling or expressing sorrow for having done wrong; or a person who does such
(2) (meaning too rare to warrant focus)