I decided to take a painkiller because I have a severe headache.

I have a severe headache and can't concentrate on my work.

This park is a place of tranquility.

He took a deep breath to simmer himself down.

I thought his behavior was really cruel.

Aldehyde is a very important compound in organic chemistry.

I think his behavior is unjust.

I think his actions are completely inhumane.

It seems like he has been poisoned by something.

He was poisoned after eating something.