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All answers having "Expressionless" as clue:

4 Character Answers:

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WAIT



5 Character Answers:

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BLANK

STONY



6 Character Answers:

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GLASSY

VACANT

WOODEN



7 Character Answers:

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DEADPAN



8 Character Answers:

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IGNOMINY



10 Character Answers:

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GLASSYEYED

POKERFACED

STONEFACED

STRAIGHTFD