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All answers having "Weak" as clue:

3 Character Answers:

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DIM

ILL

TEA

WAN



4 Character Answers:

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COLD

FORT

LAME

PALE

PUNY

SOFT

THIN



5 Character Answers:

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ANILE

FAINT

FRAIL

KNEED



6 Character Answers:

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ANEMIC

EFFETE

FEEBLE

FLIMSY

INFIRM



7 Character Answers:

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ANAEMIC

EPICENE

FLACCID

LANGUID

TENUOUS



8 Character Answers:

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ASTHENIC

DECREPIT



9 Character Answers:

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SPINELESS



10 Character Answers:

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NAMBYPAMBY

WISHYWASHY



12 Character Answers:

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ACHILLESHEEL