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"weariness" is also used as a crossword clue. If that's what you saw, the answer is often fatigue (7 letters).
Definitions
temporary loss of strength and energy resulting from hard physical or mental work
Word origin
From Middle English werynes, werinesse, from Old English wēriġnes (“weariness”), equivalent to weary + -ness.
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Heavy tired feeling”9 letters
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