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All answers having "Hostility" as clue:

3 Character Answers:

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IRE



5 Character Answers:

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ANGER

LARGE



6 Character Answers:

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ANIMUS

ENMITY

HEARTH



7 Character Answers:

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ICINESS

ILLWILL



9 Character Answers:

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ANIMOSITY



10 Character Answers:

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ALIENATION

ANTAGONISM