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"definitely" is also used as a crossword clue. If that's what you saw, the answer is often decidedly (9 letters).
Definitions
without question and beyond doubt
Word origin
From definite + ly.
Used in a sentence
“Joe definitely doesn't know how to drive a tractor.”
“She said she wasn't coming, definitely.”
“It was really impossible on board that ship to get away definitely from Almayer”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“For sure”10 letters
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