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All answers having "Weakness" as clue:

4 Character Answers:

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FLAW

VICE



6 Character Answers:

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ANEMIA

FOIBLE



7 Character Answers:

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ANAEMIA

FAILING

FRAILTY

LANGUOR



8 Character Answers:

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DEBILITY

SOFTSPOT



9 Character Answers:

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BLINDSPOT

IMPOTENCE



10 Character Answers:

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TENDERNESS



12 Character Answers:

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ACHILLESHEEL