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All answers having "Grotesque" as clue:

4 Character Answers:

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UGLY



5 Character Answers:

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ANTIC

WEIRD



7 Character Answers:

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BIZARRE

HIDEOUS

MACABRE

SURREAL



8 Character Answers:

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GARGOYLE



9 Character Answers:

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FANTASTIC

UNNATURAL



10 Character Answers:

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PHANTASTIC