blabbermouth

In a sentence

If it weren't for that blabbermouth Sally, the principal would never have known we did it.

त्यो बातुनी स्यालीको कारण नभएको भए, प्रधानाध्यापकलाई यो हामीले गरेको कहिल्यै थाहा हुने थिएन।