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All answers having "Negative" as clue:

2 Character Answers:

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NO



3 Character Answers:

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BAD

NAH

NAW

NAY

NOR

NOT

YIN



4 Character Answers:

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NOPE

NYET



5 Character Answers:

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MINUS

NOSIR



7 Character Answers:

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ADVERSE

SUBZERO



8 Character Answers:

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DRAWBACK



11 Character Answers:

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UNFAVORABLE