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All answers having "Impetuous" as clue:

3 Character Answers:

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HOT



4 Character Answers:

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RASH

SNAP



5 Character Answers:

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BERET

BRASH

FIERY

HASTY

HEADY

LUCID

REELS



6 Character Answers:

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MADCAP

TYRANT



7 Character Answers:

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CANASTA

TEARFUL



8 Character Answers:

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HEADLONG

VEHEMENT



9 Character Answers:

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FOOLHARDY

HOTHEADED

OVEREAGER



10 Character Answers:

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HALFCOCKED



11 Character Answers:

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APPROPRIATE

WARMBLOODED



12 Character Answers:

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TRIGGERHAPPY