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"truthfully" is also used as a crossword clue. If that's what you saw, the answer is often honestly (8 letters).
Definitions
In an honest or accurate way.
Word origin
From truthful + -ly.
Used in a sentence
“He spoke truthfully.”
“The common gay does well being less concerned with joining the Great Gay Bandwagon […] and more concerned with living unostentatiously, honestly, truthfully, and quietly.”
“Truthfully, I didn't suspect a thing.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Honestly”10 letters
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