Translation of infirm in Spanish

Are you a man or a woman? You have no picture in your profile, and I do not know whether the user name loli2938 belongs to a man or a woman, but actually it does not matter to me. I am here for the Spanish.
Was that all? I was sure that I had a lot more mistakes, because I did not know how to express myself properly. Maybe I am a natural born talent. I am just kidding. Let me know if you need something else.
I teach at the university of natural sciences. I have studied at the ETH in Zurich. At that time I started learning Spanish and I found Vocabulix. Since then I'm using it regularly with joy.