All 3 Uses

discreet
in
A Room With A View
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You are conscious of having said something indiscreet?†
Chpt 8

indiscreet = not trustworthy, or improper, or attracting unwelcome attention

standard prefix: The prefix "in-" in indiscreet means not and reverses the meaning of discreet. This is the same pattern you see in words like invisible, incomplete, and insecure.
No, I have said nothing indiscreet.†
Chpt 8
And all the time three little bundles lay discreetly on the sward, proclaiming: "No. We are what matters.†
Chpt 12 *

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)