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All answers having "Barren" as clue:

4 Character Answers:

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AFID

ARID

POOR

SERE

VOID



5 Character Answers:

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EMPTY

STARK



6 Character Answers:

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DESERT



7 Character Answers:

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STERILE



8 Character Answers:

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DESOLATE

TREELESS



9 Character Answers:

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INFERTILE