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All answers having "Ugly" as clue:

3 Character Answers:

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FEO



4 Character Answers:

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MEAN



5 Character Answers:

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ASSIN

NASTY

SNIDE



6 Character Answers:

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ODIOUS



7 Character Answers:

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HIDEOUS



9 Character Answers:

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MEANFACED



10 Character Answers:

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BADLOOKING

ILLFAVORED