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All answers having "Uncouth" as clue:

4 Character Answers:

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BASE

NONU

RUDE



5 Character Answers:

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CRASS

CRUDE



6 Character Answers:

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COARSE

GAUCHE

OAFISH

VULGAR



7 Character Answers:

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BOORISH

ILLBRED

LOUTISH



8 Character Answers:

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CHURLISH