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All answers having "Terrifying" as clue:

5 Character Answers:

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AWFUL

DREAD

SCARY



6 Character Answers:

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FEARED



7 Character Answers:

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AWESOME

GHASTLY

MEDUSAN

REDWOOD

SCARING



8 Character Answers:

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FEARSOME



10 Character Answers:

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HAIRAISING



11 Character Answers:

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HAIRRAISING



13 Character Answers:

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SPINECHILLING