Translation of harder in Spanish

I learned Russian during 8 years in highschool, but since I left school 6 years ago, I have forgotten most of it and did not have opportunity to speak or practice in any way. That's why I am on Vocabulix.
I'm quite tired too by now. So, if it doesn't work just drop me an email and I'll see it first thing in the morning. I wanted to add new words to the dictionary however the other issues kept me more busy than I have imagined.
During the summer it can get pretty hot and humid here in Florida (strong winds from the south also happen, hurricanes), but I still think that Florida is an exciting and diverse state also in the summer.