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Faultlessly means in a way that shows no mistakes — you do the thing without a slip. It is the adverb of faultless, so it has the same slightly formal, praising feel. You put it with verbs of doing: play, speak, copy, perform, land, execute. A can play a piece faultlessly; a clerk can copy a list faultlessly. Though actually, like faultless, it is about errors in the work, not about whose blame it was. It also gets stretched: “faultlessly polite” may mean the manners never cracked, not that the person felt perfectly kind inside.
毫無瑕疵地；完美無誤地
原始詞典資料1 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。
faultlesslyadv/ˈfɔːlt.ləs.li/
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In a faultless manner.
- The interior of the "castle" was as faultlessly neat as its exterior was novel. The entire space, some twenty feet by forty, was subdivided into several small sleeping-rooms; the apartment into which he first entered, serving equally for the ordinary uses of its inmates, and for a kitchen.
- It is much easier to detect a fault than to produce a harmonious arrangement. And it is much easier for a man to see faults in a lady’s dress than to give directions for dressing faultlessly.
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。