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All answers having "Polite" as clue:

4 Character Answers:

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YESM



5 Character Answers:

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CIVIL



6 Character Answers:

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PROPER

URBANE



7 Character Answers:

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COURTLY

GENTEEL

REFINED



8 Character Answers:

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HAZELNUT

MANNERED

MANNERLY

WELLBRED



9 Character Answers:

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COURTEOUS



12 Character Answers:

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WELLMANNERED