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All answers having "Quick-witted" as clue:

3 Character Answers:

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APT



4 Character Answers:

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KEEN



5 Character Answers:

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AGILE

ALERT

ALIVE

SHARP

SMART



6 Character Answers:

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ADROIT

ASTUTE

BRIGHT

CLEVER

NIMBLE



15 Character Answers:

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BRIGHTASABUTTON