If something is inadvertent, you did it without realizing what you were doing. An inadvertent error. An inadvertent click. An inadvertent insult — you did not mean to hurt, but the words still landed.

If something is inadvertent如果某件事是inadvertent，you did it你做的時候 without realizing what you were doing沒有意識到自己在做什麼。An inadvertent error無心的錯誤。An inadvertent click不小心點到。An inadvertent insult無心的冒犯——you did not mean to hurt你不是故意要傷人，but the words still landed但話還是說出口、造成了傷害。

It describes the act or the result, not a lazy person as a whole. Slightly formal; news and school writing like it.

It describes它形容的是 the act or the result這個行為或結果，not a lazy person as a whole不是整個人懶惰。Slightly formal稍微正式一點；news and school writing like it新聞和學校寫作喜歡用。

In speech, “I didn’t mean to” does much of the same work.

In speech口語裡，"I didn't mean to"「I didn't mean to」 does much of the same work做的是差不多的工作。

Though actually it is not a pair with “advertisement”. The old Latin idea is “not turning your mind toward it”. Students who spot advert inside sometimes think of ads; that is a different road in modern English.

Though actually不過其實 it is not a pair with "advertisement"它跟「advertisement」不是一對詞。The old Latin idea is古老的拉丁文原意是 "not turning your mind toward it"「沒有把心思轉向那件事」。Students who spot advert inside有些學生看到裡面的advert sometimes think of ads會聯想到廣告；that is a different road in modern English但那是現代英文裡另一條路。

The everyday -ly form is inadvertently.

The everyday -ly form is日常的-ly形式是 inadvertentlyinadvertently。