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All answers having "Vain? ___?" as clue:

3 Character Answers:

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MOI



4 Character Answers:

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IDLE

IVAN



5 Character Answers:

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NOWIN



6 Character Answers:

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FUTILE

OTIOSE



7 Character Answers:

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STUCKUP

USELESS



9 Character Answers:

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CONCEITED

FRUITLESS



14 Character Answers:

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STUCKONONESELF



15 Character Answers:

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PROUDASAPEACOCK