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"fairly" is also used as a crossword clue. If that's what you saw, the answer is often quite (5 letters).
Definitions
to certain extent or degree
Word origin
From Middle English fayrly, fayrely, vayrliche, equivalent to fair + -ly.
Used in a sentence
“A jury is expected to ensure that the accused is fairly judged.”
“a town fairly situated for foreign trade”
“Consumer laws aim to have consumers fairly treated.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“To a moderate degree”6 letters
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