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All answers having "Abrupt" as clue:

3 Character Answers:

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CAT



4 Character Answers:

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CURT

RASH

RUDE



5 Character Answers:

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BATON

BLUNT

BRIEF

CHILL

CLACK

GRUFF

RAPID

SHORT

STEEP

TERSE

UNION



6 Character Answers:

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EXCEED

GENEVA

SUDDEN



7 Character Answers:

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BRUSQUE

NATURAL



11 Character Answers:

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MERCHANDISE