'Suomalainen' has no gender and can also be used to refer to things. You can use it with a noun or alone.
Hilla on suomalainen = Hilla is Finnish / Hilla is a Finn.
Tämä lamppu on suomalainen = This lamp is Finnish.
Also with a noun:
Suomalainen ruoka on hyvää = Finnish food is good.
Man, finnish is easier than I thought. I always take some lessons in new courses here, but I never keep practicing most of them. I think I want to learn finnish after this lessons. I know it'll become harder further but I started hungarian and finnish at same time, I can say I remember almost all words I learned in finnish but for hungarian I can't remember even how to say "hi".