发呆 (fā dāi): to stare blankly; to be stunned; to be lost in thought

During class, Xiaoming kept staring blankly out the window; the teacher called him twice but he didn't hear.

After hearing the bad news, she sat on the sofa without saying a word, just staring blankly.

He was too tired from work and couldn't help zoning out during the meeting, almost missing important content.

At night, I was alone on the balcony staring blankly, thinking about what happened during the day, and before I knew it, half an hour had passed.

Stop staring blankly and help me figure out how to solve this problem.