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All answers having "Outward appearance" as clue:

3 Character Answers:

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AIR



4 Character Answers:

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FACE

GARB

MIEN



5 Character Answers:

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FRONT

GUISE

LOOKS



6 Character Answers:

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FACADE

VENEER

VISAGE



8 Character Answers:

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PRETENSE



9 Character Answers:

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SEMBLANCE