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All answers having "Malicious" as clue:

3 Character Answers:

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BAD

ILL



4 Character Answers:

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EVIL

MEAN



5 Character Answers:

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CATTY

NASTY

SNIDE



6 Character Answers:

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FUTILE

WANTON



8 Character Answers:

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SPITEFUL



10 Character Answers:

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MALEVOLENT