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All answers having "Blunt" as clue:

4 Character Answers:

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BALD

CURT

DULL

SNUB



5 Character Answers:

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FRANK

GRUFF

NAKED

STARK

TERSE



6 Character Answers:

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DEADEN

OBTUND

OBTUSE

POINTB



8 Character Answers:

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EDGELESS

IMPOLITE

TACTLESS



9 Character Answers:

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OUTSPOKEN



10 Character Answers:

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FOURSQUARE