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All answers having "Questionable" as clue:

4 Character Answers:

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IFFY

MOOT



5 Character Answers:

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DUBUS

FISHY

SHADY

SHAKY



7 Character Answers:

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SKETCHY

SUSPECT



8 Character Answers:

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ARGUABLE



9 Character Answers:

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EQUIVOCAL



10 Character Answers:

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SUSPICIOUS



11 Character Answers:

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PROBLEMATIC