Which do you think is the most difficult language? Why?

I\'ve tried to learn French and Spanish several years ago. Those two are the only languages I\'ve learned outside of English. Among them, I think French is the most difficult language. I was longing to speak French especially, so I signed up for an online class last year but I failed to learn again. The reason I think French is the most difficult is because of its conjugation. When I was a child, it was quite difficult for me to accept the concept of conjugation and the perfect tense in English. French has more than that of English. There are lots of things to understand and memorize in first but I think I lost my ability and passion of memorizing. I regret I should learned some when I was a middle (or high) school student. Second reason is because of its pronunciation. At least, Spanish is quite easy for Koreans to pronounce. But in French, I have to make a voice in a different way that I\'ve never used before.