He is spending money unreasonably.

I apologize for not contacting you for a long time.

He likes to take a walk in the park at dusk.

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.

I learned about anhydrides in chemistry class.