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"faithfulness" is also used as a crossword clue. If that's what you saw, the answer is often loyalty (7 letters).
Definitions
the quality of being faithful
Word origin
From Middle English feithfulnesse, equivalent to faithful + -ness.
Used in a sentence
“faithfulness to the original”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Loyalty”12 letters
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