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All answers having "Unctuous" as clue:

4 Character Answers:

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OILY



5 Character Answers:

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SLEEK

SLICK

SOAPY



6 Character Answers:

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GREASY

SMARMY



7 Character Answers:

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OILLIKE



10 Character Answers:

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OLEAGINOUS



11 Character Answers:

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HYPOCRISIES