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All answers having "Impressive!" as clue:

3 Character Answers:

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AHH

BIG

OOH

WOW



4 Character Answers:

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EPIC

NICE



5 Character Answers:

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AWFUL

GREAT

NOBLE



7 Character Answers:

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AWESOME

NICEONE

STATELY



8 Character Answers:

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HANDSOME

IMPOSING

NOSLOUCH

STRIKING



9 Character Answers:

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GRANDIOSE