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Truthfully is the adverb form of 'truthful' - it means 'in an honest way' or 'telling the truth'. You use it to describe how someone speaks or answers - 'answer truthfully' means don't lie. People also often put it at the start of a sentence, almost like 'honestly' or 'to be honest', to signal they're about to say something true, even if it's a little or not what people want to hear.
誠實地；老實說
原始詞典資料2 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
truthfullyadv/ˈtɹuːθ.fəl.i/
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mannerIn a truthful manner
- 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.
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Frankly.
- Truthfully, I didn't suspect a thing.
- Truthfully, I was kind of average until my life went from snooze to snazztastic in about sixty seconds.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。