Stempled

When a teacher makes countless mistakes, leaving the students to correct him or her. This happens most often with teachers who do not know how to teach or are not familiar with their subject.

The teacher stempled so badly that I had to teach her an easier way to solve the problem that she wrote.

She stempled so many times in the lesson that nobody knew what they were doing.

After stempling the same problem five times, the teacher just decided to write a new one