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"honestly" is also used as a crossword clue. If that's what you saw, the answer is often truthfully (10 letters).
Definitions
in an honest manner
Word origin
From Middle English honestly, honestlyche, honestliche, equivalent to honest + -ly.
Used in a sentence
“He answered the questions honestly.”
“I can't honestly say that I feel any elatement at the prospect.”
“Nevertheless, you must know (if I am to speak honestly to you) that I do not repent me those dallyings in enchanted fields.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Truthfully”8 letters
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