Taylor was usually a cheerful boy, but today he looked solemn, and I wanted to know what was going on.
Example sentence - The grandfathers funeral was quite a solemn occasion for all.
The solemn man looked at the grave and grieved.
Solemn means "serious", so you could say "when he told me of my friend's death, he looked very solemn".
That funeral was the first solemn occasion in my life.