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All answers having "Flexible" as clue:

3 Character Answers:

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RHO



4 Character Answers:

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ACDC

HOSE

LIAR

LIMP



5 Character Answers:

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AGILE

BENDY

LITHE



6 Character Answers:

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AIRSEA

LIMBER

PLIANT

SUPPLE



7 Character Answers:

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ELASTIC

LISSOME

PLASTIC

PLIABLE

RUBBERY



8 Character Answers:

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BENDABLE

NONRIGID

OBDURATE



9 Character Answers:

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ADAPTABLE

MALLEABLE

RESILIENT



11 Character Answers:

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GOOSENECKED