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All answers having "Unthinking" as clue:

4 Character Answers:

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DUMB

RASH

ROTE



5 Character Answers:

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BIMBO

HASTY



7 Character Answers:

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FOOLISH

ROBOTIC



8 Character Answers:

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BONEHEAD

KNEEJERK

MINDLESS

VISCERAL



10 Character Answers:

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IRRATIONAL