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All answers having "Weaken" as clue:

3 Character Answers:

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EBB

SAG

SAP



4 Character Answers:

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FADE

FLAG

GELD

MELT

TIRE

WILT



5 Character Answers:

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ABATE

BLUNT

EBONY

ERODE

ROGUE

UNMAN



6 Character Answers:

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DILUTE

FALTER

IMPAIR

WARBLE



7 Character Answers:

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DEPRESS

UNNERVE

VITIATE



8 Character Answers:

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ENERVATE

ENFEEBLE

ETIOLATE



9 Character Answers:

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ATTENUATE

EMBRITTLE

UNDERMINE

WATERDOWN



10 Character Answers:

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DEBILITATE

EMASCULATE



13 Character Answers:

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STAFFORDSHIRE