Question: what do you think is the most difficult language?
Answer: Polish. ... 
Navajo. ... 
Greek. ... 
Korean. ... 
Mandarin. ... 
Japanese. ... 
Cantonese. The tones in Mandarin make it a challenge for English speakers, but Cantonese has twice as many tones as Mandarin—eight in total. ... 
Arabic. To learn Arabic, you have to learn a new alphabet, and get used to reading from right to left.