Brisk

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late 16th century: probably from French brusque (see brusque).

wiktionary

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Uncertain. Compare Welsh brwysg and French brusque.

etymonline

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brisk (adj.)

"quick or rapid in action or motion, swift, lively," 1550s, as Scottish bruisk, which is of uncertain origin; perhaps an alteration of French brusque (see brusque). Related: Briskly; briskness.