**Here are some examples of using the word «accidentally»:**
1. I accidentally knocked over a vase when I was cleaning the room.
2. She accidentally sent the message to the wrong person.
3. He accidentally stepped on my foot when he walked by.
4. We accidentally locked the keys in the car and couldn't get in.
5. The chef accidentally added too much salt to the soup.
6. I accidentally deleted all my photos from my phone.
7. He accidentally hit the ball into the neighbor's yard.
8. She accidentally left her umbrella in the train.
9. I accidentally sent a private message to the whole group.
10. He accidentally put sugar in his tea instead of milk.
In all these examples, «accidentally» is used to describe an unintentional action or event.