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All answers having "Dim ___" as clue:

3 Character Answers:

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RHO

SUM



4 Character Answers:

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BLUR

FADE

HAZY

PALE



5 Character Answers:

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BLEAR

FAINT

GRIEF

LOWER

MISTY

MURKY

UNLIT



6 Character Answers:

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BLEARY

DARKEN

ILLLIT

OBTUSE

SAVAGE

STUPID



7 Character Answers:

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OBSCURE



10 Character Answers:

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INDISTINCT

PEABRAINED



13 Character Answers:

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UNINTELLIGENT