He is immersed in the study of panmagic squares.

He is a perfectionist, and his approach to work is very strict.

He played a perfect fifth scale on the piano.

He is a perfectionist, so he is very strict about his work.

He delivered the news with a shameless smile.

I think his behavior is completely shameless.

This coffee is sugar-free.

This painting is drawn in achromatic color, and its beauty stands out.

His rash actions surprised the people around him.

He is known for his rash actions.