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All answers having "Sturdy" as clue:

4 Character Answers:

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JEAN



5 Character Answers:

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HARDY

OAKEN

SOLID

STERN

STOUT

TOUGH



6 Character Answers:

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ROBUST

RUGGED

STRONG

UNSAFE



7 Character Answers:

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DURABLE



8 Character Answers:

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STALWART

WELLMADE



9 Character Answers:

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SEAWORTHY

WELLBUILT



10 Character Answers:

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LARGEBONED