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All answers having "Frail" as clue:

4 Character Answers:

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WEAK



5 Character Answers:

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ALOOF

REEDY

WISPY



6 Character Answers:

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FEEBLE

INFIRM

SLIGHT



7 Character Answers:

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WHETHER



8 Character Answers:

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DELICATE



9 Character Answers:

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CHANTEUSE

WARRANTED