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All answers having "Not moving" as clue:

3 Character Answers:

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RHO



4 Character Answers:

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FIRM

IDLE



5 Character Answers:

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INERT

STILL



6 Character Answers:

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ATREST

STATIC



7 Character Answers:

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ATASTOP

STABILE

STALLED

THOUGHT



8 Character Answers:

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STAGNANT



10 Character Answers:

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STATIONARY