严厉 (yán lì): nghiêm trọng

The coach is very strict with us, demanding that we do our best in every training session.

Dad severely criticized my younger brother because he lied.

Although the teacher is strict, the students all know that she means well for them.

This company has strict requirements for its employees; being late once will result in a salary deduction.

His tone was severe, and the children immediately quieted down.