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All answers having "Unproductive" as clue:

3 Character Answers:

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DRY

RHO



4 Character Answers:

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ARID

IDLE



6 Character Answers:

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BARREN

BIGTOP

INARUT



7 Character Answers:

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DEADEND

STERILE

USELESS



9 Character Answers:

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FRUITLESS



12 Character Answers:

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SWASHBUCKLER