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All answers having "Imposing" as clue:

3 Character Answers:

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BIG



4 Character Answers:

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EPIC

TALL



5 Character Answers:

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GRAND



6 Character Answers:

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AUGUST

SOLEMN



7 Character Answers:

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LEVYING

STATELY



9 Character Answers:

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GRANDIOSE



10 Character Answers:

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STATUESQUE



15 Character Answers:

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POTEMKINVILLAGE

TALLINTHESADDLE