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All answers having "Energetic" as clue:

3 Character Answers:

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LEO



4 Character Answers:

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GOGO

LIVE

SPRY



5 Character Answers:

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ALIVE

BRISK

LUSTY

PEPPY

PERKY

VITAL

ZESTY

ZIPPY



6 Character Answers:

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ACTIVE

HEARTY

LIVELY

SNAPPY



7 Character Answers:

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DYNAMIC

VIBRANT



8 Character Answers:

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HUSTLING

TIRELESS

VIGOROUS