strict teacher

A strict teacher, I worked with him for five years, the most remarkable years of all my violin study.

Frankh was a careful and strict teacher; Josef not only was taught to sing well, but learned much about various instruments.

Mme. Grieg proved a strict teacher, who did not allow any trifling; the dreamy child found he could not idle away his time.

Bobby was forever getting into trouble with the strict teacher.