All 4 Uses

discreet
in
Sweet Far Thing
(Auto-generated)

It wouldn't do for her to ask me discreetly.†
Chpt 1 *
He makes discreet inquiries among the younger girls, turning it into a sort of game to see if any of them have heard or seen some clue, however small.†
Chpt 3
An orchestra plays discreetly behind a tall, red screen painted with Chinese dragons.†
Chpt 4
Discreetly, I wave my hand at her skirts and they whoosh up, exposing her petticoats and pantalets.†
Chpt 4

Definitions:

(1) (discreet as in: discreet--not showy or gossipy)
trustworthy with secrets or subtle (not attracting attention)

This sense of discreet sometimes indicates that something is small (so as not to attract attention) as in "discreet earrings."
(2) (discreet as in: discreet--not foolish)
sensible and careful; possibly having good manners

This sense of discreet is more commonly seen in classic literature than in modern writing. There is may also refer to having the judgment to exercise good manners.
(3) (meaning too rare to warrant focus)