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All answers having "Frighten" as clue:

3 Character Answers:

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AWE



4 Character Answers:

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STLE



5 Character Answers:

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ALARM

DAUNT

SCARE

SPOOK

UNMAN

WINCE



6 Character Answers:

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DENTAL



7 Character Answers:

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STARTLE

TERRIFY

UNNERVE



10 Character Answers:

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INTIMIDATE



15 Character Answers:

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THROWASCAREINTO