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"oddness" is also used as a crossword clue. If that's what you saw, the answer is often eccentricity (12 letters).
Definitions
eccentricity that is not easily explained
Word origin
From Middle English oddenesse; equivalent to odd + -ness.
Used in a sentence
“Neither was he intimate with any of the other bigger boys, who were warned off by his oddnesses, for he was a very queer fellow; […]”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Strange quality”7 letters
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