Honest mistake: A mistake made unintentionally or unknowingly and without the intention of causing harm; a mistake that anyone might have made in similar circumstances. As in It was an honest mistake! How was I to know that you wouldn’t want me to send that letter with the rest of the mail?
中文释义：honest的意思是：诚实的，正直的，诚恳的。mistake的意思是：过失，过错。honest mistake的意思就是：无心之过。不是故意的”还能怎么表达？“我不是故意的”其实就是我无意冒犯的意思：No offence. 例句：例句：He assaulted me for an honest mistake（他因为我的一个无心之失而攻击我。）