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All answers having "Impulsive" as clue:

4 Character Answers:

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NOON

RASH

SNAP



5 Character Answers:

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BRASH

GIDDY

HASTY

QUICK



6 Character Answers:

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MADCAP



8 Character Answers:

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QUIXOTIC

RECKLESS



15 Character Answers:

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SPUROFTHEMOMENT