Something that is unintentional is not done deliberately, but happens by accident.
例句
Perhaps he had slightly misled them, but it was quite unintentional...也許他給他們造成了小小的誤導，但他不是有意的。There are moments of unintentional humour.有幾個并非出于本意的引人發笑之處。
英英詞典釋義
Adjective
1. not done or made or performed with purpose or intent
2. without deliberate intent;
"my heart with unwilled love grew warm"- George Macdonald
3. not intentional;
"an unintended slight""an unintentional pun""the offense was unintentional""an unwitting mistake may be overlooked"