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All answers having "Incisive" as clue:

4 Character Answers:

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KEEN



5 Character Answers:

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SHARP



6 Character Answers:

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BITING



7 Character Answers:

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ARTICLE

CUTTING

POINTED



8 Character Answers:

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ONTARGET



9 Character Answers:

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TRENCHANT



11 Character Answers:

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NEEDLESHARP

PENETRATING



13 Character Answers:

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CONSTELLATION