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All answers having "___ dire" as clue:

4 Character Answers:

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GRIM

VOIR



5 Character Answers:

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ACUTE

AWFUL

CESTA

GRAVE



6 Character Answers:

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TRAGIC



7 Character Answers:

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PARLOUS



8 Character Answers:

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DREADFUL

TERRIBLE



11 Character Answers:

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UNUTTERABLE