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All answers having "Vicious" as clue:

4 Character Answers:

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ACID

EVIL

MEAN

VILE



5 Character Answers:

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CRUEL

NASTY

RABID

YAHOO



6 Character Answers:

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FIERCE

HECTIC

SAVAGE



8 Character Answers:

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SADISTIC



11 Character Answers:

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ROGUEIMPALA