The most careful, cautious, or tactful; showing the greatest amount of discretion or restraint in behavior and speech.
Superlative form of 'discreet,' from Old French 'discret' via Latin 'discretus.' The superlative ending '-est' was added to create the most extreme version of the quality of being discreet.
The superlative form '-est' is one of the oldest ways English speakers rank things—it goes back to Old English and Germanic languages, making it thousands of years old. Yet we still use it the same way today!
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