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"inactivity" is also used as a crossword clue. If that's what you saw, the answer is often dormancy (8 letters).
Definitions
being inactive; being less active
Word origin
From in- + activity or inactive + -ity.
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Idleness”10 letters
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I_________