discreet -- (marked by prudence or modesty and wise self-restraint; "his trusted discreet aide"; "a discreet, finely wrought gold necklace")
discerning, discreet -- (unobtrusively perceptive and sympathetic; "a discerning editor"; "a discreet silence")
circumspect, discreet -- (heedful of potential consequences; "circumspect actions"; "physicians are now more circumspect about recommending its use"; "a discreet investor")
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