I. Comparative
1. sadder
I am even sadder that you've ever imagined.
2. as sad
I heard about that accident... I'm exactly as sad as you are.
3.less sad
This decision doesn't make me less sad than I am.
II Superlative
1. very sad
This story makes me very sad.
2. Saddest
If you leave I will be the saddest person in the world.
Sper ca te am ajutat!