In your opinion , what is the toughest language to learn?
 

From personal experience

I would say Spanish.

English

only ever did french at school and got an E for GCSE so i guess that

I've tried learning Cantonese and that's pretty hard, definitely the hardest of the one's I've learnt (french and spanish in school)

Japanese

The fact that dough, plough, cough and rough dont rhyme makes English a pretty stupid language. There are hundreds of other examples of this

Any language that uses a different scripture I guess

All languages are difficult to learn imo.

But even though I've been brought up learning it from Nursery (compulsory here in schools) Welsh is tricky but good once you get a hold of it.

A toss up between China and Japanese, i´d think. Although some say that Finnish is the one of the hardest ones.