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All answers having "Hideous" as clue:

3 Character Answers:

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YET



4 Character Answers:

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UGLY



6 Character Answers:

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OGRISH



7 Character Answers:

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GHASTLY



8 Character Answers:

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GRUESOME



9 Character Answers:

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REPULSIVE

UGLYASSIN



12 Character Answers:

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SPINALCOLUMN