the act of saying or doing something without thinking about the effect it may have, especially when this reveals something secret or something that could be embarrassing or offensive
بیاحتیاطی, بیملاحظگی, نسنجیدگی
He talked to the press in a moment of indiscretion.
He had never forgiven her for reporting his indiscretion in front of his friends.
I instantly regretted my indiscretion and asked her to keep the news to herself.