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All answers having "Negligent" as clue:

3 Character Answers:

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LAX



4 Character Answers:

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NOSY



5 Character Answers:

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LORDS

SLACK



6 Character Answers:

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CLEAVE

REMISS



7 Character Answers:

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MANSION

MUSTARD



8 Character Answers:

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CARELESS

DERELICT

HEEDLESS

OMELETTE



10 Character Answers:

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ASSISTANCE